high flow cats. Too expensive - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 07-05-2005, 08:49 PM   #21
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Quote:
Originally Posted by 1993 SLE
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Originally Posted by BillBost37
Unless you are seriously modded 3" will not do anything for you.
even the 11 and 12 second Bonnes are running totally stock exhaust
Really. well I guess i'll get 2.5", if its not going to make a differance. This is my first modern car. Im use to old muscle cars. (the bigger the better).
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Old 07-05-2005, 09:04 PM   #22
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Yeah...but how many times did you put 3" duals on a car? You had to push some serious vapor for that.
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Old 07-05-2005, 09:12 PM   #23
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Quote:
Originally Posted by Professor Fate
Really. well I guess i'll get 2.5", if its not going to make a differance. This is my first modern car. Im use to old muscle cars. (the bigger the better).
I definately wouldn't waste my time going to something bigger. My dad runs a 2.25" exhaust on his GTP and when he takes it off (open 3" downpipe) the car isn't any quicker. With his old setup he dynoed 303whp with the exhaust off and 315whp with it on. Too big can hurt you more than too small.

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Old 07-05-2005, 09:14 PM   #24
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You have a point there, the back pressure creates torque right?
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Old 07-05-2005, 09:41 PM   #25
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there have been many studies done by the hot roddin magazines on tube size for both headers and exhaust out. BIGGER is not always BETTER.
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Old 07-05-2005, 10:43 PM   #26
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Not always, X. Not always. SSEi95 lost low end torque, and dbtk2'* Dad proved otherwise in his GTP.
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Old 07-06-2005, 12:54 AM   #27
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Quote:
Originally Posted by BillBost37
Yeah...but how many times did you put 3" duals on a car? You had to push some serious vapor for that.
I ran duel 3" on my 66 440ci plymoth, and it loved it. It pushed a ton of vapor.(half of it unburnt). it had way more power than the stock duel 2.25 or 2.50.(whatever it had). Anyways, I trust your guys opinion and will stay with a 2.5 cat.
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Old 07-06-2005, 09:06 AM   #28
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Quote:
Originally Posted by willwren
Not always, X. Not always.
i thought i did say "not always"

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BIGGER is not always BETTER.
Oh yeah, i did!
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Old 07-11-2005, 04:36 PM   #29
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Default How 'bout NO Cat??

Hey, all. I am paying close attention to this and a few other threads about performance upgrades, so what if you just cut the catalytic converter OFF and replaced it with a straight pipe?

Is there a sensor that would need fooling? How bad is my exposure for legal problems?

Oh, and :P

thanks!! Jim O. (remind me to change my sig; I sold the GTO)

'97 SSE with hogged-out airbox (thanks, guys!) and removed engine installation plates...
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Old 07-11-2005, 06:30 PM   #30
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Not sure about over in the Hoosier state, but over here in the Keystone state if the proper authorities catch you running a car that is supposed to have a cat (i.e. not grandfathered in), they will give you a nice hefty fine. You can take the chance, but I would say that it'* not worth it.
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