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).
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!