lt's on a 91
Thread Starter
Racer
Joined: Jan 2007
Posts: 486
Likes: 1
From: Jacksonville Florida
lt's on a 91
Looking to pick up a 91 in a few weeks (fingers crossed). I been looking around online and looks like I can get some headers pretty reasonably. Now most say 87-91, now I know the 91 body is a little different, but will the same headers fit? I know they are the same L98 as far as I know.
How easy is the install? I know the F-body can be a nightmare. I also want to run true duals. Is it best to have an h or x pipe in place?\
Also, what kind of gains have you guys seen with exhausts? Any seat of the pants difference?
Thanks guys! Hope to be back in a vette soon
I miss the wave......
How easy is the install? I know the F-body can be a nightmare. I also want to run true duals. Is it best to have an h or x pipe in place?\
Also, what kind of gains have you guys seen with exhausts? Any seat of the pants difference?
Thanks guys! Hope to be back in a vette soon
I miss the wave......
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
As far as the headers, yes they should fit fine. I am not real sure on the install, are you looking at long tubes or shorties?
I always go X-Pipe, my thought has always been the air crossing each other will almost cause like a vacuum right there and help flow the exhaust out. The H-Pipe never seemed good to me, I would think there would be minimal exhaust go through the H because of the vacuum like pressure going across the opening on both sides.
just my .02, get the X and longtubes
I always go X-Pipe, my thought has always been the air crossing each other will almost cause like a vacuum right there and help flow the exhaust out. The H-Pipe never seemed good to me, I would think there would be minimal exhaust go through the H because of the vacuum like pressure going across the opening on both sides.
just my .02, get the X and longtubes
Last edited by 95BlueBomber; Feb 5, 2009 at 10:09 AM.
Thread Starter
Racer
Joined: Jan 2007
Posts: 486
Likes: 1
From: Jacksonville Florida
I'd never waste time on shorties. Yeah I heard that the cross pipe would help some, just wanted to double check. Also if I get one with EGR and O2 is there a place where they can delete them from the computer? Or can have it done locally by a tuner? No emissions here so I dont care about that.
Thanks again guys
Thanks again guys
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
I took mine off my 88 and got the air pump delete kit from a vendor. I believe you can delete it all with no problems. I cant remember if I left the EGR sensor plugged in and attached it to the firewall or not. I think Breathless performance is where I got that delete kit. It cleans the engine bay up a lot! It also will free up some power.
BTW nice lookin ride!
BTW nice lookin ride!
Pro
Joined: Feb 2007
Posts: 740
Likes: 2
From: San Antonio TX
I have a 91 and I installed the headman elites without the air/egr acc. Fairly easy install. I also installed a 3-wire o2 at the bung. As far as performance ,I can't really tell you I did a whole engine, exhaust with true dual and x-pipe all at the same time..You're not going to have any problems with the a/c bracket, I don't know if you get it with the air/egr acc.
Thread Starter
Racer
Joined: Jan 2007
Posts: 486
Likes: 1
From: Jacksonville Florida
Thanks, but thats the my old 91 I sold 2 years ago 
The ones I am looking at are both 91 and both bright red as well. I need to tint them like that one though. Even the whole windshield was done!
I love white vettes, but hey they never wrote a song about a little WHITE corvette now did they
The ones I am looking at are both 91 and both bright red as well. I need to tint them like that one though. Even the whole windshield was done!
I love white vettes, but hey they never wrote a song about a little WHITE corvette now did they
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
Thanks, but thats the my old 91 I sold 2 years ago
The ones I am looking at are both 91 and both bright red as well. I need to tint them like that one though. Even the whole windshield was done!
I love white vettes, but hey they never wrote a song about a little WHITE corvette now did they
The ones I am looking at are both 91 and both bright red as well. I need to tint them like that one though. Even the whole windshield was done!
I love white vettes, but hey they never wrote a song about a little WHITE corvette now did they
All Corvettes are RED!
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Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
I'd never waste time on shorties. Yeah I heard that the cross pipe would help some, just wanted to double check. Also if I get one with EGR and O2 is there a place where they can delete them from the computer? Or can have it done locally by a tuner? No emissions here so I dont care about that.
Thanks again guys
Thanks again guys
Thread Starter
Racer
Joined: Jan 2007
Posts: 486
Likes: 1
From: Jacksonville Florida
bwv505, what part of town? I'm on southside/baymeadows. My buddy has a MINT 95 white with red leather, and that kind of got me bitten by the vette bug again. Now that the family has a big 3 row suv to haul everyone around, the wife didnt care what I got to drive...WOO HOO! I hope the one I want is still available in another couple weeks when I get my taxes.
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
Thats exactly what I want. I have had some h/c lt1/4 cars and my trans am had the egr and o2 deleted from the computer via a mail order tune. I didnt know if L98 had similiar support out there.
bwv505, what part of town? I'm on southside/baymeadows. My buddy has a MINT 95 white with red leather, and that kind of got me bitten by the vette bug again. Now that the family has a big 3 row suv to haul everyone around, the wife didnt care what I got to drive...WOO HOO! I hope the one I want is still available in another couple weeks when I get my taxes.
bwv505, what part of town? I'm on southside/baymeadows. My buddy has a MINT 95 white with red leather, and that kind of got me bitten by the vette bug again. Now that the family has a big 3 row suv to haul everyone around, the wife didnt care what I got to drive...WOO HOO! I hope the one I want is still available in another couple weeks when I get my taxes.
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
on my 88 I deleted the cat and you just need to put the 02 back in the pipe. Just have a bung welded in and put it back. The rear 02 does nothing but keep the cat in check. As long as its reading its fine, it doesnt change fueling to the ecm.
Thread Starter
Racer
Joined: Jan 2007
Posts: 486
Likes: 1
From: Jacksonville Florida
So just to be clear on the exhaust. I want longtubes, straight back, no cats, maybe little bullet muffler...maybe, then tips on the rear. Now with this on an L98, i dont need to worry about the rear O2? Or I just need to get an extension and have a bung welded in?
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
i just moved from Arlington, there was always 1 rough looking one around. I never see c4's, there are several c5s at work though.
So just to be clear on the exhaust. I want longtubes, straight back, no cats, maybe little bullet muffler...maybe, then tips on the rear. Now with this on an L98, i dont need to worry about the rear O2? Or I just need to get an extension and have a bung welded in?
So just to be clear on the exhaust. I want longtubes, straight back, no cats, maybe little bullet muffler...maybe, then tips on the rear. Now with this on an L98, i dont need to worry about the rear O2? Or I just need to get an extension and have a bung welded in?
Thread Starter
Racer
Joined: Jan 2007
Posts: 486
Likes: 1
From: Jacksonville Florida
Like I said it was on a LT car. My old 91 vette, was stock except for muffler deletes. So I'm just trying to clear up whats needed to run true duals? Just bolt in and go? Because I found some painted headers new for under 200 for a 91, but they have no emissions stuff on them.
Melting Slicks
Joined: May 2007
Posts: 2,171
Likes: 1
From: Warwick RI
Like I said it was on a LT car. My old 91 vette, was stock except for muffler deletes. So I'm just trying to clear up whats needed to run true duals? Just bolt in and go? Because I found some painted headers new for under 200 for a 91, but they have no emissions stuff on them.
I will let someone that actually has a small block chime here
There is a point where you have to use a heated sensor and I am not sure how far back that is.
Heck, I can't even spell EFI
Pro
Joined: Oct 2008
Posts: 706
Likes: 265
From: Jyväskylä, FINLAND
You can remove the EGR diagnostics from the chip, but the chip needs to be replaced or bypassed partially. This is, what we did with my '91:
Had the EGR diagnostics disabled (and fans on/off temperatures changed):
And the new chip will be installed so that it only bypasses part of the original chip functions, the original chip still operates everything except engine diagnostics:
Then the new chip was burned and pressed on its place:
The original chip is still with at all times, if the burned chip should somehow act faulty: