Performance advantage of removing CATS.
Pro
Joined: May 2000
Posts: 741
Likes: 0
From: Etowah, Tennessee
It should cause no problems at all..just good results! I have had no cats at all on my '91 L98 for 5 or more years, and I now have 160,000 miles on her...no pinging, no problems, no codes at all. Just a wonderful sound, more power, and a happy grin on my face! She sounds SO much better, and you don't have to worry about excessive heat build-up like you do with the cats. I have received so many compliments about how sweet my Vette sounds, many say it sounds better than any V8 they have heard in years (when I pass them)... 
In all seriousness, dump them all if you can...it is sweet, and makes the Vette sound like a real sports car! 
In all seriousness, dump them all if you can...it is sweet, and makes the Vette sound like a real sports car!
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by bowersock
Nascar currently uses 104 octance pump gas, really.
check out:
www.laserchassis.com
www.worldofoutlaws.com/thedirtydozen
orwww. volusiacountyspeedway.com
Roger
check out:
www.laserchassis.com
www.worldofoutlaws.com/thedirtydozen
orwww. volusiacountyspeedway.com
Roger
More then likely they are using Sunoco Supreme Leaded - 112 octane. This is for the cup cars. They could be using the GT-Plus in the Busch and weekend series cars as a method of keeping speeds down.
Team Owner
Joined: Sep 2002
Posts: 22,209
Likes: 12
From: OBAMA IS HITLER
Originally Posted by bogus
I would install a high-flow center cat. It will also make the car quieter. You can also do dual bullet cats, with a nice Xpipe. 
The added bonus is having my hearing back again......having zero cats, long tube headers, and a modified engine isn't very much fun on the highway. I can barely hear Led Zeppelin blasting 9/10ths of the way up on the Blose with all the loud racket going on out the rear
Last edited by Red Tornado; Feb 1, 2005 at 04:59 PM.
Instructor
Joined: Nov 2004
Posts: 190
Likes: 0
From: Greenville Ohio
St. Jude Donor '05
cats
for some reason the laser chassis link does not work.
www.volusiaspeedwaypark.com
www.worldofoutlawslatemodelseries.com
I am pretty sure Nascar is using the 104 unleaded in all their touring series.
Roger
www.volusiaspeedwaypark.com
www.worldofoutlawslatemodelseries.com
I am pretty sure Nascar is using the 104 unleaded in all their touring series.
Roger
Team Owner
Joined: Sep 2001
Posts: 62,119
Likes: 1,725
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Its not going to cause any problems with the O2 to remove the main cat. If you put the O2 downstream further, then yes it will. It shouldnt cause problems with anything as far as the running of the engine, its going to run better. Power should be up by at least 10-15 from removing the main cat entirely, our cats are extremely restrictive on the L98, thats not the case on LT1. EGR is not necessary either, not for proper engine function, you just have to delete the Code 32 from the chip. Detonation can occur when its deleted entirely because it helps that when the engine is hot, but you can correct for that in other ways and not have burnt gases reinjected into your engine, which is really why I dont like EGR.
I would install the new main cat, which is what i'm going to do very soon when my headers go on. The new cats today flow 10x better than the 86's cats and the cat will reduce resonance, so I dont see a huge performance loss coming.
I would install the new main cat, which is what i'm going to do very soon when my headers go on. The new cats today flow 10x better than the 86's cats and the cat will reduce resonance, so I dont see a huge performance loss coming.
