L98 Dual exhaust
Thread Starter
Advanced
Joined: Dec 2002
Posts: 61
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From: Akron Ohio
L98 Dual exhaust
I'm looking to open up the exhaust on my 1990 that is stock other than minor bolt ons. I would like some opinions on a few options.
1 After market 2 1/4 dual with good muflers
2 Custom 2 1/2 dual with good muflers
3 larger after market high flow front and rear Ys with good mufflers
I have no plans for using haeders at least at this time, and I will install high flow Cat or Cats.
I tried using the FAQ but unable to get it to work
Thanks
Paul / KTA1000
1 After market 2 1/4 dual with good muflers
2 Custom 2 1/2 dual with good muflers
3 larger after market high flow front and rear Ys with good mufflers
I have no plans for using haeders at least at this time, and I will install high flow Cat or Cats.
I tried using the FAQ but unable to get it to work
Thanks
Paul / KTA1000
Le Mans Master
Joined: Aug 2006
Posts: 7,698
Likes: 0
From: Just the Tip... Just to see how it feels...
The L98 is very restrictive when it comes to exhaust, so 
on replacing it.
I would recommend that if you do change your exhaust, to go with headers (check state laws).
Corsas are fantastic and have very low resonance, if you have the $$$. go for it.
on replacing it.I would recommend that if you do change your exhaust, to go with headers (check state laws).
Corsas are fantastic and have very low resonance, if you have the $$$. go for it.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
I would remove the front cats, sleeve the pipes, and replace the main cat with a hi-flow Magnaflow cat. I did this and really like the result. Total cost $200. Find a good muffler shop and weld everything.
Then do a catback system. Corvette Central sells a Magnaflow aluminized catback system for $299 plus ship. Part # 324120.
www.corvettecentral.com
The difference on a car without headers between 2 1/4" and 2 1/2" pipes won't matter.
Then do a catback system. Corvette Central sells a Magnaflow aluminized catback system for $299 plus ship. Part # 324120.
www.corvettecentral.com
The difference on a car without headers between 2 1/4" and 2 1/2" pipes won't matter.
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
I used a true dual system, with magnaflow mufflers and an H-pipe from Corvette Central. I am pleased with the system and would buy it again. You can check my website for before and after pics of the installation.
Race Director
Joined: Jun 2004
Posts: 13,969
Likes: 710
From: WI
I used a true dual system, with magnaflow mufflers and an H-pipe from Corvette Central. I am pleased with the system and would buy it again. You can check my website for before and after pics of the installation.
Thread Starter
Advanced
Joined: Dec 2002
Posts: 61
Likes: 0
From: Akron Ohio
I would remove the front cats, sleeve the pipes, and replace the main cat with a hi-flow Magnaflow cat. I did this and really like the result. Total cost $200. Find a good muffler shop and weld everything.
Then do a catback system. Corvette Central sells a Magnaflow aluminized catback system for $299 plus ship. Part # 324120.
www.corvettecentral.com
The difference on a car without headers between 2 1/4" and 2 1/2" pipes won't matter.
Then do a catback system. Corvette Central sells a Magnaflow aluminized catback system for $299 plus ship. Part # 324120.
www.corvettecentral.com
The difference on a car without headers between 2 1/4" and 2 1/2" pipes won't matter.
Le Mans Master
Joined: Jun 2006
Posts: 5,642
Likes: 5
From: One day you're a Comet...the next day you're dust... Arkansas
Click on the C4 section then search by part number. It is 324120.
I don't have pictures, it is a direct OEM replacement type muffler. The y-pipe has a crossover.
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Thread Starter
Advanced
Joined: Dec 2002
Posts: 61
Likes: 0
From: Akron Ohio
Go to www.corvettecentral.com
Click on the C4 section then search by part number. It is 324120.
I don't have pictures, it is a direct OEM replacement type muffler. The y-pipe has a crossover.
Click on the C4 section then search by part number. It is 324120.
I don't have pictures, it is a direct OEM replacement type muffler. The y-pipe has a crossover.
Is there an advantge with the cat back with muflers compared to just putting those muflers on my stock rear Y ?
thanks
Paul / KTA1000
Racer
Joined: Oct 2001
Posts: 311
Likes: 2
From: Roseburg OR
LT1 force 2
I put the Flowmaster force 2 system for the LT1 on my 90. Got rid of cats and had a pipe bent to mate to the stock manifolds. Used the hangers for the LT1 by changing a couple bolts on the rear end, have been told I could have used the L98 hangers.
Very happy with it, sounds good, no resonance in 6th at 70 MPH (used to be my problem speed). Was the best bang for the buck I could find.
I'd stay away from a system that mimics the L98s single pipe that splits at the rear. Might be part of the resonance problem.
Also look for a used stock LT1 system, better than the L98 and sometimes you can find it for free.
Very happy with it, sounds good, no resonance in 6th at 70 MPH (used to be my problem speed). Was the best bang for the buck I could find.
I'd stay away from a system that mimics the L98s single pipe that splits at the rear. Might be part of the resonance problem.
Also look for a used stock LT1 system, better than the L98 and sometimes you can find it for free.
Drifting
Joined: Mar 2004
Posts: 1,504
Likes: 0
From: Byron Center MI
This is what I'm doing this winter. I will be putting on headers, bullet cats and the LT1 system. The LT1 system I got has muffler eliminators and stock resonator. If it is too loud I have some LT4 mufflers waiting for it.
Instructor
Joined: Jun 2005
Posts: 219
Likes: 0
From: Davison Michigan
I am also doing the Lt1 conversion on my L98 this winter. I hope to get away without any fab work. I will be replacing my original exhaust manifolds with Lt1 manifolds, bought from forum member for $60. I will use Lt1 stock cats, bought from forum member for $65. And I got the Lt1 exhaust for free. As long as I don't have any issues with bolting on the LT1 exhaust manifolds there should be 0 fab work.
Drifting
Joined: Mar 2004
Posts: 1,504
Likes: 0
From: Byron Center MI
I am also doing the Lt1 conversion on my L98 this winter. I hope to get away without any fab work. I will be replacing my original exhaust manifolds with Lt1 manifolds, bought from forum member for $60. I will use Lt1 stock cats, bought from forum member for $65. And I got the Lt1 exhaust for free. As long as I don't have any issues with bolting on the LT1 exhaust manifolds there should be 0 fab work.
Safety Car
Joined: Jan 2006
Posts: 3,566
Likes: 4
From: Mt Laurel NJ
St. Jude Donor '06-'07
I am also doing the Lt1 conversion on my L98 this winter. I hope to get away without any fab work. I will be replacing my original exhaust manifolds with Lt1 manifolds, bought from forum member for $60. I will use Lt1 stock cats, bought from forum member for $65. And I got the Lt1 exhaust for free. As long as I don't have any issues with bolting on the LT1 exhaust manifolds there should be 0 fab work.
Instructor
Joined: Jun 2005
Posts: 219
Likes: 0
From: Davison Michigan