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2004 Pontiac Grand Prix GT1 4dr Sedan

2004 Pontiac Grand Prix
Trim Info:
Front Wheel Drive, 4 Door Sedan, Mid-Size
20 mpg city / 30 mpg hwy
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October 9, 2012, 10:42 pm

Alch I

Question: a question about exhaust modifying

Hello, i have a 02 Pontiac Grand Prix, i have a Exhaust cutout on it but its after the cat, can i put it where the cat is & move the cat down the exhaust toward the rear of the car? provided it would be the same or greater distance from the cutout itself

October 19, 2012, 7:06 pm

Elizabeth K

I'm not sure what you mean by cut-out, or how far down you intend to move the cat. The catalytic converter needs to be hot to work, but it doesn't seem likely that moving it a foot or two would effect that (but you can't move it closer to the engine because then it would be too hot). The most important thing to be aware of is how hot the cat gets, and locating it anywhere near the fuel tank or without proper heat shielding can cause a fire.

If by 'cutout' you meant that you're introducing fresh air in the system, the cat won't work and you'll get a permanent check engine light on when the upstream and downstream o2 sensors don't have different readings.

If that answer doesn't help, please clarify your question and I'll try to help.

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