89 Corvette front y pipe
Thread Starter
Racer
Joined: Jul 2013
Posts: 260
Likes: 49
From: Florence ALABAMA
89 Corvette front y pipe
I know this prolly has been gone over, but I just added 2 Magnaflow mufflers to my clean and stock 89 6 speed to just give it a bit more growl. The front y pipe has those pre cats; can I eliminate them and keep the main cat and O2 sensor for just a bit more sound, or do you think it will overpower my ears? Also, would I get check engine lights even though I am keeping the sensor?
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
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From: Southlake, TX
Drifting
Joined: Aug 2002
Posts: 1,775
Likes: 125
From: Birmingham AL
Yes. If cat is original pellet type then the flow is much less than the modern type. In the U.S., I think CA is the only state that requires all three. My ‘89 is exempt and therefore runs a true dual system like the later cars. It really sounds like a Vette should.
Safety Car
Joined: May 2001
Posts: 4,759
Likes: 1,647
From: Fairfax Virginia
Be sure to use a quality High Flowing catalytic in front of the exhaust system.
After changing the catalytic converter and installing a Chambered Exhaust CAT-Back system my Gtech pro said I gained almost 14 hp.
The mileage the Corvette was able to get did increase a bit and I finally saw 30 mpg on the highway.
There is no drone with the system I have.
After changing the catalytic converter and installing a Chambered Exhaust CAT-Back system my Gtech pro said I gained almost 14 hp.
The mileage the Corvette was able to get did increase a bit and I finally saw 30 mpg on the highway.
There is no drone with the system I have.
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Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
Y pipe
Hint
85’s did not have precats.
to keep from spending a bunch, order a new Y pipe for an 85, take it to your local muffler shop to install, because in 85, the cat is welded on. The pipe has no bolt on provisions downstream of the Y So your cat will have to be welded on unless your system has a clamp at the front of the cat.
it Will look stock to any inspector
85’s did not have precats.
to keep from spending a bunch, order a new Y pipe for an 85, take it to your local muffler shop to install, because in 85, the cat is welded on. The pipe has no bolt on provisions downstream of the Y So your cat will have to be welded on unless your system has a clamp at the front of the cat.
it Will look stock to any inspector
Last edited by coupeguy2001; Jul 9, 2020 at 10:01 PM.
Thread Starter
Racer
Joined: Jul 2013
Posts: 260
Likes: 49
From: Florence ALABAMA
Hint
85’s did not have precats.
to keep from spending a bunch, order a new Y pipe for an 85, take it to your local muffler shop to install, because in 85, the cat is welded on. The pipe has no bolt on provisions downstream of the Y So your cat will have to be welded on unless your system has a clamp at the front of the cat.
it Will look stock to any inspector
85’s did not have precats.
to keep from spending a bunch, order a new Y pipe for an 85, take it to your local muffler shop to install, because in 85, the cat is welded on. The pipe has no bolt on provisions downstream of the Y So your cat will have to be welded on unless your system has a clamp at the front of the cat.
it Will look stock to any inspector
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
Y pipe
You understand that in the 80’s, a 3 way cat was a big muffler.
they made the cat a 2-way cat and total catalyzed Using the precats.
your car may smell differently without precats.
but my Engine run stand uses my original cat, and it’s amazing how it controls the smell!!
also, the run stand uses a muffler from a 70 corvette, and with with the two combined, you can hear things in the engine if it had a problem.
like lifter, rod, piston slap, etc.
And i can put any small block chevy engine on it and run for valve adj, carb changes, Cam, etc before it gets in the car.
they made the cat a 2-way cat and total catalyzed Using the precats.
your car may smell differently without precats.
but my Engine run stand uses my original cat, and it’s amazing how it controls the smell!!
also, the run stand uses a muffler from a 70 corvette, and with with the two combined, you can hear things in the engine if it had a problem.
like lifter, rod, piston slap, etc.
And i can put any small block chevy engine on it and run for valve adj, carb changes, Cam, etc before it gets in the car.
Last edited by coupeguy2001; Jul 9, 2020 at 11:32 PM.