Would I lose HP with GMMG chambered exhaust? (LS1) - LS1TECH



New LS1 Owners - Newbie Tech Basic Technical Questions & Advice
Sponsored by:
Sponsored by:

Would I lose HP with GMMG chambered exhaust? (LS1)

Reply
 
Thread Tools Search this Thread
Old 03-15-2017, 10:51 PM   #1
Teching In
Thread Starter
 
J-FredZ28's Avatar
 
Join Date: Jun 2013
Location: Plover, WI
Posts: 30
Default Would I lose HP with GMMG chambered exhaust? (LS1)

Hey guys I'm considering going with the GMMG chambered exhaust set up, I've heard how it sounds on a few 4th gen LS1 Camaros and I like it.

My car is a 98 Z28 6 speed it has 3" magnaflow exhaust, SLP loudmouth longtube headers, high flo cats, k&n air intake, TSP Torquer V4.

So I'm wondering would I lose horsepower going from the 3" magnaflow set up I have to the chambered GMMG exhaust?

Thanks!!
J-FredZ28 is offline   Reply With Quote
Old 03-16-2017, 07:04 AM   #2
TECH Enthusiast
iTrader: (3)
 
R6cowboy's Avatar
 
Join Date: Feb 2010
Location: Northern IL
Posts: 650
Default

Maybe 1 or 2 hp if any. Nothing to be concerned about or noticeable.
R6cowboy is offline   Reply With Quote
Old 03-16-2017, 10:08 PM   #3
Pontiacerator
iTrader: (12)
 
RevGTO's Avatar
 
Join Date: Nov 2003
Location: Wichita KS / Rancho San Diego
Posts: 5,071
Default

Have you heard it on cars with longtubes? It's a whole 'nother animal with longtubes vs. stock manifolds. Loudness and rasp can be issues with LT's.
RevGTO is offline   Reply With Quote
Old 03-17-2017, 11:59 AM   #4
12 Second Club
iTrader: (2)
 
murphinator's Avatar
 
Join Date: Sep 2009
Location: southern Maine
Posts: 1,602
Default

I 2nd revGTO's thoughts.
I have had 4 LS1 f bodies to date , the only one that sounded terrible and had bad drone was a 273 auto car with pacesetter long tubes and gmmg , better gears may have helped the situation a lot. on the other hand my M6 car with QTP long tubes, x pipe True duals that dump at the rear end sounds fabulous with no drone. My 373 stalled a 4 car has kooks/off road y , and stainless magnaflow catback and sounds good while conservative.
murphinator is offline   Reply With Quote
Old 03-17-2017, 12:20 PM   #5
TECH Junkie
iTrader: (6)
 
MonmouthCtyLS7's Avatar
 
Join Date: Jan 2005
Location: Browns Mills NJ/ Rotondo West FL
Posts: 3,807
Default

Quote:
Originally Posted by J-FredZ28 View Post
Hey guys I'm considering going with the GMMG chambered exhaust set up, I've heard how it sounds on a few 4th gen LS1 Camaros and I like it.

My car is a 98 Z28 6 speed it has 3" magnaflow exhaust, SLP loudmouth longtube headers, high flo cats, k&n air intake, TSP Torquer V4.

So I'm wondering would I lose horsepower going from the 3" magnaflow set up I have to the chambered GMMG exhaust?

Thanks!!
There both good catbacks so not enough to worry about either way, lose or gain.
MonmouthCtyLS7 is offline   Reply With Quote
Old 03-17-2017, 04:13 PM   #6
Teching In
Thread Starter
 
J-FredZ28's Avatar
 
Join Date: Jun 2013
Location: Plover, WI
Posts: 30
Default

Quote:
Originally Posted by RevGTO View Post
Have you heard it on cars with longtubes? It's a whole 'nother animal with longtubes vs. stock manifolds. Loudness and rasp can be issues with LT's.
I can't say whether or not they had Longtubes.. That's something I definitely didn't consider!
I'm just trying to get a wicked sounding idle, while not sounding like crap going through the gears and at full throttle. The thing about the 3" magnaflow system I have on my car is it's not crazy at idle, but at wide open throttle it sounds awesome.. I'm just nervous about buying different systems and wasting time and money to find a good tone.. Any suggestions for what I'm trying to get at guys? Thanks so much for the input! Very appreciated..
J-FredZ28 is offline   Reply With Quote
Old 03-17-2017, 05:18 PM   #7
On The Tree
iTrader: (1)
 
Join Date: Jul 2013
Location: NY
Posts: 148
Default

Check out the Texas Speed cat back with the cut out built in. I just ordered one, it should be here Monday. It was based on the magnaflow system but is louder. Plus you have the option to install a e-cut out when you want it really loud.
dave04da is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
gmmg vs true duals M-Z28 Generation III External Engine 59 12-28-2015 09:43 AM
WTB GMMG Chamber Exhaust GinoLS1 Parts Wanted 5 04-13-2008 09:04 AM
Single Chamber in I pipe w/GMMG??? rsodeputy61 Generation III External Engine 24 11-26-2007 06:06 PM
Homemade GMMG Chambered Exhaust? Bipolar Generation III External Engine 28 12-21-2005 04:42 PM
GMMG Optional oval tips, or not? BlkBrdWS6 Appearance & Detailing 5 07-17-2003 04:19 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 10:32 PM.


 
  • Ask a Question
    Get answers from community experts
What's your question?
Send