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2001 Toyota Celica SX
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but is it okay for the car or does it damage it

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Caleb
2000 Toyota Celica
Caleb
2000 Toyota Celica
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taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.

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Wheezy Joe
2002 Kawasaki Ninja 250
Wheezy Joe
2002 Kawasaki Ninja 250
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how is a decrease in back pressure an increase in Performance? confused


To have played and laughed with enthusiasm
and sung with exultation
To know even one life has breathed easier
This is to have succeeded.

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Bruce Leroy
2002 Toyota Celica GTS
Bruce Leroy
2002 Toyota Celica GTS
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Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused

Yeah I thought that if you loose backpressure you will loose Performance.


I'm gonna take your little Civic. Dust it off. Turn it sideways and stick it straight up you candy A*s.

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Caleb
2000 Toyota Celica
Caleb
2000 Toyota Celica
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Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused

because it allows your engine to perform better.

as you know, air tends to 'stick' to surfaces--any surface. with an exhaust, air must be 'pushed' out of it and your engine has to work to do that.

without an exhaust, your engine just 'throws' it's emissions out without having to work as hard as pushing it out through a piping.

thats why aftermarket perforamance exhausts have a wider diameter--so air has less friction as it travels along the length of the piping thumbsup

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Caleb
2000 Toyota Celica
Caleb
2000 Toyota Celica
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Originally Posted by GTSHYPR
Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused

Yeah I thought that if you loose backpressure you will loose Performance.

nope. you will lose some initial torque though.

some backpressure is good for torque, however..in the higher rpms your torque will be made up and your whp will incease, also. thumbsup

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Caleb
2000 Toyota Celica
Caleb
2000 Toyota Celica
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in all aftermarket Performance exhausts & headers, initial torque will be DECREASED, this is because backpressure is reduced therefore your lower rpm torque decreases. (in an Intake your initial torque also decreases).

however, the gains on the top-end are considerred more than worth it because you gain more at the top than you lose at the bottom. that's why theres a market for aftermarket bolt-ons. thumbsup

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Bruce Leroy
2002 Toyota Celica GTS
Bruce Leroy
2002 Toyota Celica GTS
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Well I guess ya learn something new everyday.


I'm gonna take your little Civic. Dust it off. Turn it sideways and stick it straight up you candy A*s.

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Caleb
2000 Toyota Celica
Caleb
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Originally Posted by GTSHYPR
Well I guess ya learn something new everyday.

thumbsup thats what i'm here for--to learn and to hopefully help some other people learn as well.

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2000 Toyota Celica GT
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2000 Toyota Celica GT
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Originally Posted by GTSHYPR
Well I guess ya learn something new everyday.

Me too... well not in great detail - but something grin


1988 Toyota Celica 2.0 GTi-16 and 2000 Toyota Celica VVT-i

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Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.

Last edited by slidr; Apr 6, 2004 9:32am.

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Caleb
2000 Toyota Celica
Caleb
2000 Toyota Celica
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Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.

exhaust is an accumulative term, or it can mean just the rear piping.

the actual 'exhaust' includes everything from your engine to your tailpipe.

a lot of time we use the term exhaust just to mean the part from the header/downpipe to the tailpipe.

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Most people don't know that exhausts come of the header. They are made of pipe. Usually metal pipe. Sometimes there will be catalytic converters in the pipe to help with the exhaust smell. It can be really smelly without a Catalytic converter!! Sometimes Exhausts have resonators on them. This can make things resonate. I am not exactly sure what...but you get the idea.

Just my 2 bits!!!












BUAWAAHAHAHAHAHAHAHAHAHAAHH!!

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Originally Posted by Rocketman
Most people don't know that exhausts come of the header. They are made of pipe. Usually metal pipe. Sometimes there will be catalytic converters in the pipe to help with the exhaust smell. It can be really smelly without a Catalytic converter!! Sometimes Exhausts have resonators on them. This can make things resonate. I am not exactly sure what...but you get the idea.

Just my 2 bits!!!












BUAWAAHAHAHAHAHAHAHAHAHAAHH!!
I think the resonator reduces the sound of the exhaust.


Aqua Teen Hunger Force...number one in the hood, G

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Originally Posted by sPeEd4tHeNeEd
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.

exhaust is an accumulative term, or it can mean just the rear piping.

the actual 'exhaust' includes everything from your engine to your tailpipe.

a lot of time we use the term exhaust just to mean the part from the header/downpipe to the tailpipe.
That's why it matters where you remove it at. Taking it off from the rear axle on back will help Performance a little, but would just be too noisy.

Taking it off before the cat and from the header could cause some problems.

It all depends on where he takes it off at. He wasn't really too specific about it.


Aqua Teen Hunger Force...number one in the hood, G

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05 WRB
2005 Subaru WRX STi
05 WRB
2005 Subaru WRX STi
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that's how nascar's run...


we had a tundra getting headers installed on it and the mechanic just had open headers on..no exhaust...



you do not want to know how loud it was...omg, it was awesome.


SUBARU TECNICA INTERNATIONAL

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Originally Posted by slidr
Originally Posted by Rocketman
Most people don't know that exhausts come of the header. They are made of pipe. Usually metal pipe. Sometimes there will be catalytic converters in the pipe to help with the exhaust smell. It can be really smelly without a Catalytic converter!! Sometimes Exhausts have resonators on them. This can make things resonate. I am not exactly sure what...but you get the idea.

Just my 2 bits!!!












BUAWAAHAHAHAHAHAHAHAHAHAAHH!!
I think the resonator reduces the sound of the exhaust.

I KNOW!!! It was a joke...gone bad...

Joined: Mar 2004
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Senior Member
2002 Toyota Celica GT
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Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused

wtf You'll lost low end but it'll more than make up for it in top end

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2004 Dodge SRT4
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lmao. i took off my axle back and listend to it for a while, then i installed kazuma, and let me tell you...kazuma is LOUDER


was....5speed with i/h/e
15.41 @ 89.30mph 2.282 60'

is....04 srt4 stock
13.936 100.15mph 2.177 60'

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2low2slow
2002 Toyota Celica GT
2low2slow
2002 Toyota Celica GT
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Posts: 1,612
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.

exhaust is an accumulative term, or it can mean just the rear piping.

the actual 'exhaust' includes everything from your engine to your tailpipe.

a lot of time we use the term exhaust just to mean the part from the header/downpipe to the tailpipe.
That's why it matters where you remove it at. Taking it off from the rear axle on back will help Performance a little, but would just be too noisy.

Taking it off before the cat and from the header could cause some problems.

It all depends on where he takes it off at. He wasn't really too specific about it.

i believe at a certain point in reducing backpressure the top end will not make up for the low end, but what the hay every engines different


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A boats a boat, but the mystery box could be anything....Even a boat!

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There is a lot of half-right information in this thread. "Backpressure" by itself does not add torque - a smooth pattern of exhaust gas pulses leaving the engine pulling each other along adds torque. Unbolting your stock axleback section can lose some torque because it shortens the length of exhaust pipe that those pulses travel down. If you look at the TRD exhaust, which actually GAINS low end torque, the path the piping takes makes it longer than stock, so with a free flowing muffler it adds power and torque. Another reason some aftermarket exhausts lose low end is they use larger than stock piping, again allowing those exhaust pulses to slow down (picture water going through a bigger or smaller pipe) also losing low end torque. If you made a straight mandrel bent pipe from the cat back, following the same path as the TRD piping, with the same diameter piping as stock you would have much less backpressure, but you would gain horsepower AND torque (and a hell of a lot of noise!)

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^^ thank you for summarizing this thing...!! spineyes

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I learned a thing or two today. thumbsup

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