Question on stock exhaust system
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Joined: Apr 2003
Posts: 78
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From: N.E. Pennsylvania
Car: '89 Formula 350, T-Top
Engine: L98
Transmission: 700r4
Axle/Gears: Stock 3.73's
Question on stock exhaust system
what are those small diameter pipes running back to the CAT Converters? and can i get rid of them? installed subframe connectors, and those small tubes are in my way for a better fit on the exhaust.
Last edited by LIDNR2; Sep 24, 2010 at 03:43 PM.
Thread Starter
Junior Member

Joined: Apr 2003
Posts: 78
Likes: 0
From: N.E. Pennsylvania
Car: '89 Formula 350, T-Top
Engine: L98
Transmission: 700r4
Axle/Gears: Stock 3.73's
Re: Question on stock exhaust system
So, do I really need them? Or I guess I can cut the mounts and try to push them out of the way
.
.
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iTrader: (3)
Joined: Jun 2007
Posts: 2,359
Likes: 5
From: Pennsylvania
Car: 1992 Camaro RS
Engine: Rebuilt 350 going in after paint
Transmission: WCT5, 7k & counting behind the 350
Axle/Gears: 4thgen disc rear w/ 3.73 Posi
Re: Question on stock exhaust system
Doing that will give you a pretty bad exhaust leak. Also, if you have to pass any type of emissions inspection you will fail as soon as they see that. If you don't have emissions testing/visual then go ahead. Just make sure you cap the pipes coming of the cats to keep the exhaust from entering the cabin.
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Joined: Sep 2010
Posts: 64
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From: Maili HI
Car: 1989 RS,1991 Z28
Engine: TargetMaster 350, L98 350
Transmission: 700R4
Axle/Gears: 10 bolt posi 2.73s, and 3.23s
Re: Question on stock exhaust system
your best bet would be to get a set of headers for 100 bucks from jegs unless you can afford another manufacturers. then you can eliminate the "air" pump but like he said unless u have emissions then youll run into issues.
Re: Question on stock exhaust system
You can get rid of the entire AIR system on the car with little consequence. This has been discussed many times before. Even those in emmisions zones have removed thema nd still passed emmissions. Really depends on where you are.
Thread Starter
Junior Member

Joined: Apr 2003
Posts: 78
Likes: 0
From: N.E. Pennsylvania
Car: '89 Formula 350, T-Top
Engine: L98
Transmission: 700r4
Axle/Gears: Stock 3.73's
Re: Question on stock exhaust system
I only have 21000 mi. since new. all stock, except for tower brace and subframes and cold air. there is a small block that those air tubes go through, that is mounted on the outside exhaust pipe, that is giving me trouble reconnecting the exhaust Y pipe up to the passenger side manifold. should i just remove that block with a saw zaw and push them out of way? or remove hole air pump system? My county in NEPA doesnt require emmission testing, but in the near future, i see it coming.
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iTrader: (3)
Joined: Apr 2008
Posts: 3,002
Likes: 64
From: Wittman,Az
Car: 86 IROC-Z, '71 RS
Engine: 305 TPI/ 350
Transmission: 700R4/TH350
Re: Question on stock exhaust system
Most auto parts stores carry a retrofit kit which is intended for connecting new catalytic converters to the air system. It is an extremely high temperature silicone hose (Usually blue in color). You could purchase this and then cut and splice it as needed. I had to do this with my IROC to pass emissions.
Supreme Member
iTrader: (3)
Joined: Jun 2007
Posts: 2,359
Likes: 5
From: Pennsylvania
Car: 1992 Camaro RS
Engine: Rebuilt 350 going in after paint
Transmission: WCT5, 7k & counting behind the 350
Axle/Gears: 4thgen disc rear w/ 3.73 Posi
Re: Question on stock exhaust system
Most auto parts stores carry a retrofit kit which is intended for connecting new catalytic converters to the air system. It is an extremely high temperature silicone hose (Usually blue in color). You could purchase this and then cut and splice it as needed. I had to do this with my IROC to pass emissions.
I didnt't even notice you were in PA. There is a loophole to the emissions inspections in PA. Any car registered as a classic or antique is exempt from ALL emissions testing. Likewise, any car registered in your name at least 1 year and driven less than 5k miles annually is also exempt from all emissions testing. That loophole is how I have been able to get my 92 Camaro to pass the visual check with a carb and no AIR system on it.
Thread Starter
Junior Member

Joined: Apr 2003
Posts: 78
Likes: 0
From: N.E. Pennsylvania
Car: '89 Formula 350, T-Top
Engine: L98
Transmission: 700r4
Axle/Gears: Stock 3.73's
Re: Question on stock exhaust system

cutting this off,and getting that blue hose. Thanks guys...
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iTrader: (3)
Joined: Apr 2008
Posts: 3,002
Likes: 64
From: Wittman,Az
Car: 86 IROC-Z, '71 RS
Engine: 305 TPI/ 350
Transmission: 700R4/TH350
Re: Question on stock exhaust system
No problem! It will seem kind of pricy, (Around 35.00) But after 2 years on my IROC the hoses (I cut mine up into sections and used hose clamps) look like new! They wont melt or discolor.
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