Exhaust ? [Archive] - GrandAmGT.com Forum


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01-20-2011, 04:49 PM
I have a 2000 Grand Am GT, does anyone know what size the pipe is on this vehicle? I'm looking to remove the catalytic converter, and replace it with a straight pipe.

01-20-2011, 05:18 PM

01-20-2011, 05:24 PM
The cat is clogged.

2000 GT Coupe
01-20-2011, 05:40 PM
Do you have other problems, burning oil, etc that would cause the cat to get clogged? As to the stock size I dont remember sorry.

01-20-2011, 05:43 PM
Yeah it did, but everything is fixed accept the cat now. Thats sucks I cannot find any info for it online anywhere!

01-20-2011, 06:17 PM
If I remember its 2 1/4".

01-20-2011, 07:14 PM
isnt 2 1/4 the SE and the GT is 2.5? I would get a magnaflow cat in there. shouldnt run with out one if you have to go through emisions

01-20-2011, 07:30 PM
GT: 2.25"

SE: 2"

Ridding the cat is pointless, Magnaflow makes a direct fit model for $180.

01-20-2011, 07:36 PM
;1148316']GT: 2.25"

SE: 2"

Ridding the cat is pointless, Magnaflow makes a direct fit model for $180.

thats it.

01-21-2011, 01:48 AM
Do not Remove the cat on a car that new you are just asking for citations and running problems. You shouldn't run without one because more states, counties and cities are passing emissions testing laws. Its only a matter of time before every state has the same laws as California state wide. Texas is already well on its way to being as bad as California as far as state inspection goes.

01-21-2011, 11:07 AM
OK, I will check out the Magnaflow one, thank everyone for the info.

01-21-2011, 11:13 AM
All V6 cars (SE and GT) are 2.25" with the only difference being the extra outlet on the muffler. SE 4cyl's might be 2.25" also or the could be 2", I don't recall.

Anyway, definitely DON'T run without a cat. It makes the car sound like crap, smell bad, it's irresponsible, and yes you can get fined for it as well. There is only a 1-2hp difference between a straight pipe and a high flow cat. A Magnaflow high-flow is the way to go. :thumbs:

01-21-2011, 09:51 PM
yup it's not like we are running the original pellit style cats they had in the 70's that choked out the exhuast the honey colm style allows for plenty of flow

01-22-2011, 05:53 PM
you can look at the one on mpraing.com too