1990 olds toronado cat' question... same ol' - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-08-2004, 12:54 PM   #1
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Default 1990 olds toronado cat' question... same ol'

Ok, age old question. My exhaust has started to rumble up by my manifold. prolly a bad donut or something of that nature. kinda like all of a sudden on the way home.. maybe those train tracks I jumped? who knows anyways. I have a series I 3800 from 90' and I'm looking for an opinion on how important the cat is to the performance of this engine? needed for the back presure? just emissions? will some sensor go nutz?

the car is in great shape and cna haul *** like no other but i was just wonderin what kinda reaction I can expect from the car if I straight pipe it to the muffler?

I'm sure i am not the only one to have asked this or do it?
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Old 12-08-2004, 02:00 PM   #2
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If you install a straight pipe in place of the cat you can expect $10,000 in fines.
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Old 12-08-2004, 02:04 PM   #3
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not the question, but yeah whatever... will a straight through affect driveabilty on a performancegas milage factor?
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Old 12-08-2004, 02:07 PM   #4
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You'll find it hard to drive the car. I bet they would consider impounding it.
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Old 12-08-2004, 05:44 PM   #5
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The 3800 is tuned to work properly with all of the as installed devices. Just removing one may upset the behaviour considerably. I have not tried but suspect that removing the cat may upset the O2 sensor. YMMV.
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Old 12-08-2004, 06:28 PM   #6
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hey, we got a 90 and 91 toronado, the 91 is currently catless with the stock muffler and it has a nice exhaust note now but i cant stand the smell of a catless exhaust so a cat will probably be goin back on. the 90 is currently in the process of getting a different motor put in but when i was taking the downpipe off i noticed that it had almost rusted out all the way around the joint where it goes into the cat so we're gonna put in a small piece and put the cat back on. as far as performance goes on the 91 i noticed torque loss when i took the cat out and put in pipe. from my experiences id stick with a cat, but to each his own.
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Old 12-08-2004, 06:54 PM   #7
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my (used) cat is from "a truck".

it was really cheap, allowed the car to pass emissions (like a new car), and it works... and gives me cool resonance

Replace it. Do the environment a favour.
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Old 12-08-2004, 07:43 PM   #8
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just get a high flow cat they are real cheap on ebay.
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Old 12-09-2004, 09:21 AM   #9
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In general RWD even-fire engines are known as "3.8 liter", FWD engines are "3800s". Before that they were "231 CID V-6"*.
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