2nd Generation Specific 1986-1992 Discussion

Rb Cat Replacement/ Downpipe

Old 02-20-2004, 12:57 PM
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I drive and '87 n/a GXL. Its got a reman engine and its been streetported. Ever since the streetport it runs a little rich, and I'm looking to open up the exhaust a little to lean it out and let it breath better.



Currently I have a K&N cold air kit on the 7, and out back I have the oem exhaust. I was considering the RB cat replacement/downpipe (I think this is what they call it on the website). Was just wondering what kind of noise the cat-replacement makes, and whether or not it is street legal?? Also, will there be noticable power gains, and can I bolt this onto the stock exhaust system??



Any comments will be really helpful.



Brad
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Old 02-20-2004, 05:13 PM
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Originally Posted by B-ROB' date='Feb 20 2004, 01:57 PM
I drive and '87 n/a GXL. Its got a reman engine and its been streetported. Ever since the streetport it runs a little rich, and I'm looking to open up the exhaust a little to lean it out and let it breath better.



Currently I have a K&N cold air kit on the 7, and out back I have the oem exhaust. I was considering the RB cat replacement/downpipe (I think this is what they call it on the website). Was just wondering what kind of noise the cat-replacement makes, and whether or not it is street legal?? Also, will there be noticable power gains, and can I bolt this onto the stock exhaust system??



Any comments will be really helpful.



Brad
It is illegal to operate a car on the street without a cat if it was originally equipped with one.
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Old 02-21-2004, 09:00 AM
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The downpipe/presilencer will be pretty loud....and with your stock oem exhaust it will sound really loud and high pitched.....basically kinda ricey. But removing the cat is the best way to get nice power out of your car. You should go with the racing beat header/presilencer, and we all know that removing your cat is illegal, but around here on the east coast cops dont pull you over to check to see if you have a cat on your car...not a biggie. I put a header/presilencer on my car with a corksport exhaust and also got a bonez hiflow cat and had it fit for the header and everytime inspection comes around I stick it on there and it passes with flying colors.......
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Old 02-21-2004, 10:05 AM
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Removing the cats will give you a metalic chaimbered sound. = not good

The RB setup shouldnt be too bad with the stock cat back.
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Old 02-21-2004, 02:53 PM
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The RB pipe and presilencer sounds way better than a header with cat even with an aftermarket cat back. The pipe and silencer combo for me was quieter and deeper than when I switched to the header and high flow cat... both with the same cat back.
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Old 02-21-2004, 02:59 PM
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Originally Posted by FCmaniac' date='Feb 21 2004, 12:53 PM
The RB pipe and presilencer sounds way better than a header with cat even with an aftermarket cat back. The pipe and silencer combo for me was quieter and deeper than when I switched to the header and high flow cat... both with the same cat back.
Yeah, I noticed a deeper, throaty tone. I have RB from header to tailpipes w/ presilencer. From inside the car sounds healthy, from outside and especially from the rear it can be obnoxious.
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Old 02-22-2004, 01:27 PM
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Basically if you want more or a power gain....then go with the header/presilencer.....if your looking for better sound then you should go with the downpipe/presilencer.....I prefer the header due to the fact that more power gains......but to each his own
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Old 02-23-2004, 05:29 PM
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Thanks for all of your help...I've decided that I'm going to put the RB downpipe and presilencer on my car. I found out that there are no emissions restrictions in the province that I live, so any exhaust mod is perfectly legal.



My cats have a lot of mileage on them and are kinda clogged, and have begun to gum up my 6-port actuators, so this ulitimately led to the decision for the downpipe/presilencer... not to mention the power gains and the deeper sound.



I'll keep everyone updated on my progress.



Brad
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