Y-pipe with GMMG?
Thread Starter
Joined: Nov 2003
Posts: 6,216
Likes: 236
From: Wichita KS / Rancho San Diego
Y-pipe with GMMG? Would it make sense to install a new y-pipe from the cats back with a GMMG? I'm not planning on headers anytime soon. I have a friend with a shop who bends good pipes and the price would be good. I'd be willing to spend the money if it'd help the flow - the crimped stock pipe looks like it flows like ***.
TECH Resident
Joined: Feb 2003
Posts: 827
Likes: 0
From: Dallas, TX
Originally Posted by RevGTO
Would it make sense to install a new y-pipe from the cats back with a GMMG? I'm not planning on headers anytime soon. I have a friend with a shop who bends good pipes and the price would be good. I'd be willing to spend the money if it'd help the flow - the crimped stock pipe looks like it flows like ***.
TECH Regular
Joined: Aug 2003
Posts: 439
Likes: 0
I did this backwards.
I ripped off the crimped, flat Y-pipe on my Firehawk two years ago and replaced it with the SLP larger diameter Y-Pipe. Made a 5 RWHP gain. Sounded better, pulled ever so slightly better. It's not a dramatic difference, by any means.
Put the GMMG Chambered Exhaust on this past January and my Hawk Rawks!!!
I ripped off the crimped, flat Y-pipe on my Firehawk two years ago and replaced it with the SLP larger diameter Y-Pipe. Made a 5 RWHP gain. Sounded better, pulled ever so slightly better. It's not a dramatic difference, by any means.
Put the GMMG Chambered Exhaust on this past January and my Hawk Rawks!!!
Staging Lane
Joined: Jul 2004
Posts: 84
Likes: 0
Dawg One, have you dyno'd the difference after the GMMG? and what exhaust/catback did you have when you first replaced the Y with the SLP Y? I'm wondering how much sound difference just the SLP Y will make with my Dual/Dual.
Trending Topics
TECH Regular
Joined: Aug 2003
Posts: 439
Likes: 0
I haven't had the chance to yet. I had the factory SLP Dual/Dual when I replaced the Y-Pipe. This is considered one of the free-est flowing catbacks on the market, but it was too quiet for me. The sound difference will be minimal. The GMMG really wakes the car up.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
On The Tree
Joined: May 2003
Posts: 106
Likes: 1
From: Apache Junc, Az
When I bought my GMMG a few years back, I ask GMMG engineers this exact same question. What I was told by THEM was a Y-Pipe (with stock manifolds) made absolutely no difference on the Dyno and was a waste of perfectly good money. Hence why the Blackbird still utilized the stock Y-pipe.
