straight pipe?
Thread Starter
Registered User
Joined: Dec 2004
Posts: 84
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From: Connecticut
straight pipe?
yeah i was just curious...
lets say i got new headers like dc 4-1 ceramic headers and i already have a skunk2 catback exhaust, is it possible to just get rid of my cat converter and put in a straight pipe from the headers to exhaust... if it is possible, are there any gains from this ? it doesnt matter if its not street legal or whatever, i dont really care lol but i was just curious if this is possible and what are the ups and downs to it. thanks guys...
also, if i were to do this, whats the pipe called that i should buy...
lets say i got new headers like dc 4-1 ceramic headers and i already have a skunk2 catback exhaust, is it possible to just get rid of my cat converter and put in a straight pipe from the headers to exhaust... if it is possible, are there any gains from this ? it doesnt matter if its not street legal or whatever, i dont really care lol but i was just curious if this is possible and what are the ups and downs to it. thanks guys...
also, if i were to do this, whats the pipe called that i should buy...
Apathy Kills
Joined: Nov 2002
Posts: 60,714
Likes: 0
From: The Left Lane
Pros:
Minimal horsepower gain (2 hp max).
Cons:
Pollutes heavily.
Sounds like shit.
Horrible smell.
OBD-2 ECU will log error codes due to missing O2 sensor input.
---
As others have said, I like having clean air to breathe.
Skip the straight pipe and put the money toward a high-flow cat (when your factory cat dies).
Minimal horsepower gain (2 hp max).
Cons:
Pollutes heavily.
Sounds like shit.
Horrible smell.
OBD-2 ECU will log error codes due to missing O2 sensor input.
---
As others have said, I like having clean air to breathe.
Skip the straight pipe and put the money toward a high-flow cat (when your factory cat dies).
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:: HAN Integra FAQ: If, by some miracle, yours hasn't been stolen... check it out!
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RoadRacer
Joined: Dec 2004
Posts: 29
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From: Atlanta, GA
I have a 92 Integra and I found about a 5 HP gain when I replaced the cat with a straight pipe. Well worth it if you can make your own. It does get much louder but I noticed the difference in the upper RPM range (6-7K).
Apathy Kills
Joined: Nov 2002
Posts: 60,714
Likes: 0
From: The Left Lane
Originally Posted by anewsom
I have a 92 Integra and I found about a 5 HP gain when I replaced the cat with a straight pipe. Well worth it if you can make your own. It does get much louder but I noticed the difference in the upper RPM range (6-7K).
Since the other guy's Teg is an OBD-II model, the ECU expects to see a signal from an O2 sensor downstream of a cat converter. Removing the cat will cause the ECU to log error codes and trigger the CEL.
And my main issue with running test pipes on the street is that they turn an efficient, clean-running car into a gross polluter spewing tons of hydrocarbons, nitrides of oxygen and other pollutants.
For the 5 hp you get, it's not worth it.
Think about it this way... If enough people start running test pipes, smog will become a problem. When people start complaining about smog, the only option will be for your state to start imposing the same hellish smog laws that we have to deal with here in CA.
You don't want those legal hassles. I want breathable air. Run a catalytic converter...please!
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:: :ToDspin: - supermod - but who gives a shit?
:: HAN Integra FAQ: If, by some miracle, yours hasn't been stolen... check it out!
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RoadRacer
Joined: Dec 2004
Posts: 29
Likes: 0
From: Atlanta, GA
Originally Posted by TheOtherDave™
Again, I renew my objection.
Since the other guy's Teg is an OBD-II model, the ECU expects to see a signal from an O2 sensor downstream of a cat converter. Removing the cat will cause the ECU to log error codes and trigger the CEL.
And my main issue with running test pipes on the street is that they turn an efficient, clean-running car into a gross polluter spewing tons of hydrocarbons, nitrides of oxygen and other pollutants.
For the 5 hp you get, it's not worth it.
Think about it this way... If enough people start running test pipes, smog will become a problem. When people start complaining about smog, the only option will be for your state to start imposing the same hellish smog laws that we have to deal with here in CA.
You don't want those legal hassles. I want breathable air. Run a catalytic converter...please!
Since the other guy's Teg is an OBD-II model, the ECU expects to see a signal from an O2 sensor downstream of a cat converter. Removing the cat will cause the ECU to log error codes and trigger the CEL.
And my main issue with running test pipes on the street is that they turn an efficient, clean-running car into a gross polluter spewing tons of hydrocarbons, nitrides of oxygen and other pollutants.
For the 5 hp you get, it's not worth it.
Think about it this way... If enough people start running test pipes, smog will become a problem. When people start complaining about smog, the only option will be for your state to start imposing the same hellish smog laws that we have to deal with here in CA.
You don't want those legal hassles. I want breathable air. Run a catalytic converter...please!
I don't believe that everyone is going to run a straight pipe and cause that kind of problem. Besides any other upgrade that anyone does to there vehicle leads to more pollution. The way to gain HP is to put more air/fuel in the engine. More fuel means more polluntants. With that statement, no one should do any upgrades to there cars or they will be producing more smog.
What say you?
been there done that
Joined: Jun 2002
Posts: 30,637
Likes: 0
From: 916
Originally Posted by anewsom
I have a 92 Integra and I found about a 5 HP gain when I replaced the cat with a straight pipe. Well worth it if you can make your own. It does get much louder but I noticed the difference in the upper RPM range (6-7K).
