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How Automobiles Work


rev up your engines today I’m gonna talk
about illegal modifications to your car that can make it run faster people have
always been modifying their cars some of these modifications are legal in some
state illlegal and others now the first modification has to do with removing
mufflers from a car now when your engine is running it burns gasoline the
exhaust comes out the exhaust manifold goes down the pipes the back of the car
then it passes through the catalytic converter where unburned hydrocarbons
are burned then it goes further down through the muffler in a my own celica
there’s the muffler here it’s right in the back that’s the original muffler
this guy do it’s amazing now like most car parts the muffler is named for what
it does it muffles sounds loud noise of the engine explosions gross through
various baffles that it hits which quiets it down then it comes out the
back but mufflers besides muffling sound they also create some back
pressure some resistance to your exhaust gas freely flowing out to your engine
can breathe in and breathe out as fast as possible realize that basically your
cars engines giant air pump it’s sucking as much air as you can and it’s pumping
the burned gases out as fast as it can to be more efficient to run faster and
to just work better to some extent a muffler does reduce the power of your
vehicle that’s why you don’t see mufflers on race cars and of course it’s
why race cars make so much noise now it used to be in all the piston airplanes
they didn’t have mufflers either that’s why when you hear them flying all around
you’re gonna hear them well in Europe now they’ve made very stringent noise
regulations for small airplanes of propellers and even they are starting to
have small mufflers that have less baffles on them they reduce the noise a
little but they also reduce the power so if you remove the muffler you will have
a free-flowing engine exhaust which means it can suck air and better burn it
and throw the waste gas out as efficiently as possible but in doing so
you’re often breaking the law but the law is different in all states
for example in California a vehicle can’t make more than 95 decibels in New
York State the limit is 15 decibels you just get up louder card California
legally then you can’t a New York State well here in Texas there is no actual
decibel limit it just says that your vehicle can’t make excessive or unusual
noises these things kind of open their what is excessive and certainly what is
unusual I guess you can’t have a car that honks like a goose but that’s
leaves a lot of parameters I hear a lot of loud cars around here nobody seems
to bother them and lately I’ve seen a lot of
really loud Ferraris and Porsches in my neighborhood as it’s becoming yuppified
a lot of them backfire because they don’t have them tuned up right and they
rev them up high and they’re shifting and they back for a car should not
backfire if you do take your muffler off of your vehicle you gotta make sure that
thing is tuned up and running perfectly set perfectly because if it is you’re
gonna get a bunch of backfires the muffler will also slow down some
backfire I mean if you got a big gas leak inside the fuel injectors and it’s
dumping raw fuel in the exhaust it’s gonna backfire that too but a normally
running engine if it isn’t perfectly sawed off without a muffler they do have
a tendency to backfire more so if you just remove a muffler and your car isn’t
set up right for that flow it may not run right and of course since it’s
illegal in most places because of the noise that’s gonna make they’re all
gonna make too much noise on a regular gasoline engine they make a lot of noise
if you take the muffler off your whole systems based on oxygen sensors
catalytic converters and if you remove the muffler then you’re gonna have a
higher flow and that can often mess with the software and the readings from the
oxygen sensors and the working of a catalytic converter because the
catalytic converter actually has to store little actions and inside to burn
the hydrocarbons and if it’s flowing too fast it can’t store anything and it
won’t work right so then you’d be breaking the pollution laws now I’ve had
people in the past say hey Scotty you got to have a muffler on your car
cause you need that back pressure well if you’re driving a four-stroke engine
that’s not true you don’t need any backpressure they’re not made to need
back pressure but speaking of that back in the past when I was a young mechanic
there were a lot of two-stroke motorcycles and even two-stroke cars
like the Saab Sonett that was a bizarre v4 two-stroke engine that the Swedes
make now because of the difference in a two-stroke engine versus a four-stroke
the two-stroke engines really need a certain type of pressure in their
exhaust system in the motorcycles they call them expansion chambers if you look
at one of those old 60s or early 70s two-stroke motorcycles you see they had
these big expansion chambers on the exhaust that was so that they would
create a certain amount of pressure so the true stroke engine could run right
because two-stroke engines are completely different they don’t have the
four-stroke of the intake compression ignition exhaust they’re just two and
there gas mingles in the engine as it runs that’s one reason they pollute a lot
more but with those you take off the exhaust system of a two-stroke
motorcycle engine it’ll look like crap but that has absolutely no bearing on a
four-stroke modern car take off the muffler yep you can make it go faster to
tune it up right but you will be breaking all kinds of laws and here in
the United States especially you’d be breaking federal pollution laws because
if you did it and someone tested it on a machine they’d probably find out that’s
putting out more pollution than it should because getting rid of that back
pressure change tile the anti-pollution system works oh not another way legal
and illegal at the same time using nitrous oxide to boost the power of an
engine there’s all kinds of nitrous setups there’s wet ones where it comes
in wet mixed with the fuel there’s dry ones where it comes in by itself but
basically they’re all made to boost the power of your engine you can make a
little bitty force own around you put out 40 50 more horsepower you get a
barrel v8 engine you can end up adding hundreds of horsepower to it their
legality is kind of in no-man’s land pending upon where you live I got
friends in Australia they said New South Wales it’s totally illegal you can’t
have a nitrous oxide system on your car for street driving
we’re in Great Britain there’s no restriction on using these nitrous oxide
systems other than you have to tell your insurance company they’re gonna
copped your insurance rates cuz I know you’re making it a faster car we’re in
South Carolina in the United States you can legally have a nitrous oxide system
on your vehicle but you can’t have the tank opened to use the system while
you’re driving on the street they have it so you can have it on your car then
you can take your car to a racetrack and do it or go on a dirt road and do it but
on legal streets that you’re driving you can’t have the tank open since the tanks
closed it doesn’t put any boost you’re not boosting anything which of course
leads to guys hiding tanks and hiding the whole system so nobody can see it
but in the state of Nebraska it’s completely legal you can have it on a
street car and if you get pulled over for speeding you’ll get a speeding
ticket but they will not give you an extra ticket for having a nitrous oxide
system hooked up to the car I mean niacin oxide works it uses an oxidizer
and rocket engine so I mean this stuff does work of course there’s only a
limited amount you’re gonna have it doesn’t last all that long but when you
open it up and inject it into the system roof now of course an alarm runner will
have detrimental effects on your engine we’re not was young a lot of guys put
them in and they were always blowing their engines they’d blow a head gasket
sometimes they’d even blow the heads each engine is designed to accept a
certain amount of power and if you go over that limit it will blow up that’s
just the way that it goes no the last modifications I’m gonna talk about can
be illegal but they can really make your vehicle go faster is the use of larger
higher flowing fuel injectors on your engine the fuel injectors on your car
the floor here they’re designed to get the maximum amount of both fuel economy
and power for certain sized engine so if you put in fuel injectors and have a
higher flow rate now you’ll probably have to put a bigger fuel pump on a two
to pump the extra fuel you can get more fuel into the engine quicker and it can
increase the power that it puts out now the main reason that this would be
illegal is because it’s drastically gonna change the pollution coming out
the tailpipe unless you had a complete pro who knew how to reprogram your
computer and set it up so that it wasn’t polluting more if you put bigger
injectors on and set the car up to run with those bigger injectors and of
course you get it worst gas mileage as you pump in more fuel
but if you really wanted to do something like that they make various injectors
for various cars and you would have to have to find a mechanic or if you’re a
real computer whiz and knew how to program computers and understand air/fuel ratios
you could try to reprogram your computer so that would accept these new injectors
now if you’ve got a common car out there like a Mustang or a Camaro Dodge Charger
there’s lots of guys that do that kind of stuff you can go on the internet you
can see their advice tell you what to do and I know with my old Triumph motorcycle
it’s fuel-injected too there’s a British website that the guy gives away all the
information free you just took up the scan tool he gives you the information
of how you should reprogram certain aspects of the computer software to make
those bigger injectors work and away you go there’s a lot of guys out there that
are into speed loves sharing their information with everyone else but then
again realize these guys are going for speed a lot of times you do something
like that it’s not gonna pass any pollution tests for example on my trying
motorcycle here in Texas they don’t test motorcycles for pollution when they’re
inspected each year so it’s not like you got to worry that it’s going to make an
emissions test because they don’t emission test motorcycles here in Texas
so ultimately if you’re gonna do any of these modifications you want to check
with your local laws and see how things work in your area but if you find that a
certain thing is legal in your area or it’s not illegal go ahead just realize
as the saying goes speed is just a question of money how fast do you want
to go, so if you never want to miss another one of my new car repair videos
remember to ring that Bell

91 thoughts on “This Illegal Mod Will Add 200 Horsepower to Your Car

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  2. I live in Venezuela and the laws here are not that rigid also the gas is ridiculous cheap…only if i had a car :'(

  3. I can’t tell if Scotty is naturally hyper, or if he did a line of cocaine off the hood of his car before this video. I’m not judging, mind you. Just a thing that makes you go 🤔…

  4. Who gives a fu ck if it's legal or illegal?????
    If you like it and you want it and it can be fitted just use it or fit it anyway anyhow

  5. I was waitng for you to say,"kick out the fat chick in the passenger seat". 😂 I know,I know,I know,fat chicks need lovin too. Big girls have more fun. Big girls give you more to hold. Big girls keep you warm. Big girls usually know how to cook. A little more fluff makes the ride smoother.

  6. That's eleven minutes of my life I'll never get back. If I wanted to listen to mindless droning, I'd befriend an air conditioner.

  7. Im not sure if ny had different laws years ago but i think state wide (not including nyc) its over 90 because ive passed through areas with noise limits saying no engine braking and 90 decibel limit

  8. Increasing injector size on an NA engine without increasing airflow is damn near pointless, yea you'll get a little more power but at a large cost to economy (& emissions). Waste of money.

    But it would definitely be worth it with a nitrous kit! Or a turbo'd engine with higher boost than standard.

  9. I explain to my wife, why i need a bj when directly before going to work and coming home from work the way scotty does. Hands up and facts.

  10. Actually some engines make more power with some back pressure. reducing the backpressure reduces low rpm torqure, the power curve is moved up in the rpm range. Yes you need pack pressure on a factory street engine. 4 strokes have scavenge qualities very different than a 2 strokes. headers don't make the low end torque that log manifolds do. turbo engines have lots of backpressure.

  11. Had a rotted out cat and then the muffler fell off my 87 F150 with the 300 straight 6.
    I bought a Cherry Bomb to put on it so it would be legal but it was still so quiet I never got around to putting it on.
    I kept it in the truck.
    I figured if I ever got pulled over I could show them the muffler and say I was on my home to put it on.
    I never had to bother.

  12. The injectors- see i done this and i did notice better idling and little better snap in it but ppl think its in my head they dont believe they actually help it at all without a program tuned into your vehicle- they never mentioned the pollution….

  13. Here in Western Australia, my cousin copped a $10,000 fine and car was impounded for 28 days. $750 to retrieve his car.

    All because of NOS. Apparently you can have it in the car, as long as you have it clearly visible, and clearly disconnected.

  14. Lost all respect when he bashed sea foam. I used sea foam once on my truck and spilled all 25 10mm out the engine bay and said sorry

  15. I wonder if this guy wears tinted glasses 24 -7 , bet he has been on some stuff at least in his younger days , but I believe he is harmless.

  16. That "bizarre 2 stroke, 4 cylinder that the Swedes made" was NOT. The V4 in the SAABs was the 4 stroke German Ford Tannus V4. The 2 stroke that the Swedes used BEFORE the Ford V4 was a 841cc Saab 2-stroke Inline 3 cylinder engine.

  17. For under $100 you can get high performance mufflers that you can see through, just like a straight pipe, but still have perforations and sound deadening. I went from straight pipes to a Borla ProXS muffler with no loss of power, but 80% quieter exhaust at normal driving RPMs while still retaining the loud wide open that the straight pipes gave.

  18. They do ZERO emission checks here in Florida. Thank God I live the very heart of WAY NORTH Florida. Politics around here are like East Texas, Louisiana, Mississippi, BAMA, and Georgia. It’s very Southern and Conservative (born and raised here, my kin have been in the area since the 1840’s, back in the 1800’s my ancestors had 10,000 acres. Now it’s down to 720 acres in the family [1 SQ Mile is about 640 acres so we’re good]). We have pavement, a long range shooting range, and we STILL raise Brahmin Cattle just like my kin for almost 180 years ago. Cool Conservative Yanks are welcome. Liberal Yanks from NY, NJ, MA, Cali, etc STOP infiltrating the South and YOUR demonic “politics” (baby killers). BTW I love my K20 in my Civic SI Sedan!

  19. Do you not know that Ferrari’s and Porsche’s are tuned like the race car they are supposed to be. If you own a Ferrari, and race it or do high speeds in it, congrats to you, they are supposed to backfire. Scotty, just shut the hell up and go to an actual mechanic school

  20. I think I missed the main point of how I can gain 200hp on an illegal mod.
    There's a lot of info on how an engine works to be efficient but no details on the mod.

  21. On my old Chevette, the muffler was originally oval, but it transformed into a round one with oval ends. That thing sure could backfire.( It had a bad camshaft alignment) It also only got 13 mpg. Then the camshaft broke and had to be replaced. And with a new cam, properly aligned, the gas mileage doubled and performance drastically increased and the backfiring disappeared.. Once coming out into the street I floored it and burned rubber clear across Main Street.

  22. The Sonett you posted was actually the Sonett III, not the V-4, 2-stroke. Loved the video, but I just wanted to make you aware that was the Sonett III (1970-74) version.

  23. This dude is like my new favorite youtuber, always hated working on cars an trucks til i started seeing this dudes videos an saw him change brakes with one hand!! Lmao! Was like wth!!! Awesome vids!

  24. one in correct statement. The V4 engine you mentioned was a 4 stroke. It came after the 3 cylinder two stroke engines that Saab first used. I had a saab with a v4 4 stroke engine.

  25. I thought reducing backpressure cause more heat to flow through the exhaust port, isn't that why they sometimes use sodium filled exhaust valves?

  26. One of these days he will reveal how he boosts his energy though from the look of it it may or may not be legal 🙁

  27. Wanna know a kicker? Theres no such thing as back pressure, at least, not for normal cars, its more applicable for race cars, just like aerodynamics, it hardly plays a roll in fuel economy unless you are doing 140+ mph

  28. Vehicles don't need back pressure but it's been proven the design of collectors and exhaust manifold have what's called a scavinging effect Which most factory exhaust incorporate slightly

  29. How do you cope when driving though the different states, if your car is legal in your own state but not in the states your driving through!?

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