Replace cat with pipe?
Thread Starter
Melting Slicks
Joined: Feb 2004
Posts: 3,055
Likes: 0
From: Sarcasm. Just one of the many services I offer.
Replace cat with pipe?
Can you replace the cat with a lenght of exaust pipe for added HP instead of gutting it? That way, the cat could temporarily be clamped back on right before the emissions inspection?
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Originally Posted by ir0nmaiden420
Can you replace the cat with a lenght of exaust pipe for added HP instead of gutting it? That way, the cat could temporarily be clamped back on right before the emissions inspection?
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Originally Posted by ir0nmaiden420
what length and diameter of pipe to use? does it provide as much HP as gutting it?
Racer
Joined: Apr 2004
Posts: 298
Likes: 1
From: Springfield Missouri
Originally Posted by mikey whipreck
Try and keep the same diameter as the inlet and outlet... It will give you the same HP as gutting it, because while the cat is a larger pipe, the outlet removes any benefit because it shrinks back down to stock size. I can't remember off hand, are they 2.25 inches?
with a straight pipe, it's a smooth passageway all the way through.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
2027 Corvette vs The World: Every Model vs Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Grand Sport & Grand Sport X Launch Alongside All-New 535hp LS6 V8!
Michael S. Palmer
5 Reasons Bad Drivers Crash & 5 Ways to Avoid a Costly Mistake!
Joe Kucinski
Team Owner
Joined: Jan 2003
Posts: 20,254
Likes: 221
From: Summerland B.C. Canada
Originally Posted by mikey whipreck
Try and keep the same diameter as the inlet and outlet... It will give you the same HP as gutting it, because while the cat is a larger pipe, the outlet removes any benefit because it shrinks back down to stock size. I can't remember off hand, are they 2.25 inches?
You can buy a so called "test pipe" that replaces cat. I removed mine and cut the flange end off and welded it to a piece of pipe.
I had a shop expand the other end to slip over front Y.
