Custom Exhaust, Full exhaust system Options

[Davesceli]

Ive heard that celicas have more than one cat, GTs have three, at the manifold and at the rear.
i was thinking of making up a custom exhaust where i had a straight pipe from the manifold down to a new hi flow cat in the rear and so on. Basically going from mulitple cats to just one.

would this work or should i just stick with a cat-back?

Would it affect smog?

Does it matter that my car is an OBD-I?

This post has been edited by Davesceli: Jan 8, 2006 - 2:50 AM

[Silver94CelicaOw...]

On our GT's theres a cat found inline on the exhaust manifold, and another cat found further down the line after the flex pipe towards the middle of the car. If you get underneath the car, you should see it....its got a metal heat guard above it on the chassis of the vehicle. After the second catalytic converter, theres a stock resonator in line with the pipe also.

Best bet is to either leave the stock secondary cat in place, or have an exhaust shop fit a high-flow cat when they do the piping for emissions purposes. OBD-I or not, when your car is inspected and theres no cats it will probably give you much higher levels of everything they can fail you for. Custom is your best bet if you want to go from the manifold back with your setup without spending an arm and a leg for a brand new catback.