Hollow out cats
Safety Car
Joined: Feb 2005
Posts: 4,721
Likes: 1
From: Beautiful Down Town "SWINDLEHURST" Long Island NY
When I gots my 84, one of the muffs was missing. My first mod was Flowmaster 40's with a Dynomax after the cat pipe w/ the crossover. When looked into the cat I could see it was broken inside and cloged. I pounded the inside with a long screwdriver, tire iron, 2' long 3/4" piece of black pipe. Every so often I'd start it up to blow out the broken ceramic pieces ( the crap blew all over the driveway). Its not that hard to do.
When I install the headers in a few months I'll eather sleeve the cat or replace it w/ a 3" pipe.
:
PS edit; "Biff Buyer"---I was thinking of getting the flag set for the front targa bolts from Mid-Amercia but I like your pop-ups better
When I install the headers in a few months I'll eather sleeve the cat or replace it w/ a 3" pipe.
:PS edit; "Biff Buyer"---I was thinking of getting the flag set for the front targa bolts from Mid-Amercia but I like your pop-ups better
Last edited by RICEKILA; Mar 26, 2006 at 08:46 PM.
Burning Brakes
Joined: Nov 2005
Posts: 848
Likes: 1
From: 1992 LT1 6 speed Cayman Islands
Break the honeycomb inti shall pieces with a long screwdriver of pipe and blow it out the back. Do not try to blow it out through the mufflers or you will end up clogging them as well.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Originally Posted by yellow dragon
bash a crowabar in it with a sledgehammer, break it up enough and it will shake out.
Used a long 1" concrete drill bit in a power drill.Gone in no time.
Be aware some suggest putting a pipe through the center afterwards as the turbulence of open cat can hurt performance.
Le Mans Master
Joined: Apr 2005
Posts: 8,077
Likes: 4
From: Scarborough ONTARIO
Originally Posted by rodj
You guys do it the hard way.
Be aware some suggest putting a pipe through the center afterwards as the turbulence of open cat can hurt performance.
Be aware some suggest putting a pipe through the center afterwards as the turbulence of open cat can hurt performance.
Hurt performance with hollowed cat, been there done that, now buy that test pipe on ebay for 50 bucks. With hollowed cat i think u loose low end grunt plus it dont help to scavenge gases out so it it hurt performance.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
don't forget...it's a federal offense to remove or gut the cat.
now, the problem is, the feds are leaving it to the states to enforce this law. If your state decides to enforce, or is mandated by the EPA to test emissions, you will fail.
I would suggest something like this:
get rid of the stock L98 exhaust completely, the 383 will love you for it. Install a pair of highflow bullet cats, an x-pipe and true duals out the back. You will pick up a ton of power, and even though you are techincally violating the law, you will be well within the spirit, and it will be CLEANER than with the cluster **** of a stock setup.
now, the problem is, the feds are leaving it to the states to enforce this law. If your state decides to enforce, or is mandated by the EPA to test emissions, you will fail.
I would suggest something like this:
get rid of the stock L98 exhaust completely, the 383 will love you for it. Install a pair of highflow bullet cats, an x-pipe and true duals out the back. You will pick up a ton of power, and even though you are techincally violating the law, you will be well within the spirit, and it will be CLEANER than with the cluster **** of a stock setup.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Originally Posted by jeffyc
an other suggestion is to where a breathing mask when u do it
i didnt like the idea of breathing in that dust so i got a mask before i did mine
i didnt like the idea of breathing in that dust so i got a mask before i did mine
