New Exhaust Questions
Thread Starter
TECH Fanatic
Joined: Mar 2011
Posts: 1,313
Likes: 10
From: Maryland
New Exhaust Questions Hey guys,
I need to change my exhaust to a catted setup so that I can get my car to pass Virginia safety inspection. Currently, I have Speed Engineering 1 3/4" inch LT's, O/R Y going into the stock SLP dual/dual. I am thinking of just changing it up and doing the GMMG system from Madhammer to put into the SLP CME and American Racing 1 7/8" LT's with a catted Y. Coming from 1 3/4" inch headers with O/R Y to 1 7/8" with high-flow cats would a re-tune be recommended? I wouldn't think so, but just want to make sure.
Also, would this GMMG setup with the high-flow cats be louder than my current catless SLP Dual/Dual setup? I have never heard a GMMG system in person, but even with cats, I can't imagine much being quieter than an SLP Dual/Dual.
Thanks for any help!
I need to change my exhaust to a catted setup so that I can get my car to pass Virginia safety inspection. Currently, I have Speed Engineering 1 3/4" inch LT's, O/R Y going into the stock SLP dual/dual. I am thinking of just changing it up and doing the GMMG system from Madhammer to put into the SLP CME and American Racing 1 7/8" LT's with a catted Y. Coming from 1 3/4" inch headers with O/R Y to 1 7/8" with high-flow cats would a re-tune be recommended? I wouldn't think so, but just want to make sure.
Also, would this GMMG setup with the high-flow cats be louder than my current catless SLP Dual/Dual setup? I have never heard a GMMG system in person, but even with cats, I can't imagine much being quieter than an SLP Dual/Dual.
Thanks for any help!
IMO there is no reason to have it retuned unless for some reason your tune is on the ragged edge now.
I have the SLP dual/dual setup on my Firehawk with LT headers and ORYP and love the way it sounds.
My "guess" is the GMMG is going to quite a bit louder due to the difference in muffler design.
I have the SLP dual/dual setup on my Firehawk with LT headers and ORYP and love the way it sounds.
My "guess" is the GMMG is going to quite a bit louder due to the difference in muffler design.
On The Tree
Joined: Mar 2015
Posts: 105
Likes: 5
From: Cincinnati, Ohio
I used to run Gmmg with high flow cats and 1 7/8" headers. It's loud with or without cats lol.. but, cats will take out the rasp.
Also I doubt you would need the retune, but if you can do it yourself or get it done fairly cheap it wouldn't hurt.
You won't be disappointed with it though, its well crafted and sounds amazing. Cheers.
Also I doubt you would need the retune, but if you can do it yourself or get it done fairly cheap it wouldn't hurt.
You won't be disappointed with it though, its well crafted and sounds amazing. Cheers.
Thread Starter
TECH Fanatic
Joined: Mar 2011
Posts: 1,313
Likes: 10
From: Maryland
Awesome. Thanks for the responses I appreciate it. I love the sound of my stock SLP D/D with the headers and O/R Y, but I don't think it will be the same with cats so I think the GMMG setup is the next best thing. Thanks again guys
I didnt retune mine when I added a catted y pipe in place of my ORY. I know it doesn't tell the whole story by the AFR reading stayed the same for what thats worth. You should be fine
