codyss

A nice name brand complete Cat-Back has been tested on the car it goes on. A custom exhaust is simply thrown together by some who has no clue what will perform only what fits.

I will pay th e extra $$$ to have a tested and name brand product on my car.

Brandon97Z

iTrader: (1)

Well yeah alot of people can just through one together but if you do your homework its not hard to come up with a very well designed system that works for half the price. Have a shop bend 2.5" pipe w/resonator and your choice of muffler it will perform and sound just as well as the others not to mention everything will be welded together instead of being bolted together. Save your money for other mods .

codyss

OK, Yes you can still se a HP increase from a custom exhaust but what about noise?

The major name manufactures tuned the resonator and muffler to the car.

Anyone can slap a ricer sounding exhaust together, I prefer a refined sound.

alleycat58

And something that's backed by at least some sort of a "this won't f-up your car"/"we stand behind our product" guarantee. Might not be lifetime or what not but if you drive down the road 2 weeks later and your exhaust falls to pieces or something else goes wrong with it, you know someone's going to fix it.

Brandon97Z

iTrader: (1)

they also have a wide range of resonator lengths to suite each persons taste . Anyways not trying to debate on whats best, as nothing is really "the best" just letting people know there is an alternative to the expensive pre-made systems out there that when done right sound and perform just as good.

p7x

is neone running a hi-flow cat?

Doc

ok, I finally got off my butt and got a clip of the GMPP exhaust in action. It was windy and the temp was 44... I got my salesman to go with me and film this. He actually took 4 videos, one of which you can hear the wind more than the exhaust.
1st Run
2nd Run

Enjoy

alleycat58

SOLD (when I have the money for it that is). By far the best exhaust I've heard so far, you should ask your salesman if they'll give you a commission on it. My hands are tied as far as purchases go right now because I'm in between jobs, but as soon as I hear back from my interview from the other job (I'm hoping I have it) I will probably be picking this up.

Doc

I ordered it from gmpartsdirect.com
my parts guy will match the price on there , I save on shipping. He couldn't get it for some reason and I could online, go figure.
There is someone selling theirs...jcswosher (sp.?)
I'm glad you like

oh, I put on the cobaltSS.net stickers too I really like them....not sure if they were visable in the clip

p7x

I also have now swade to the GMPP, if only it looked like the corsa.

Shortbus

I want to order the gmpp Exhaust, but i need a site that takes paypal.

alleycat58

Yeah, it sounds incredible!!!!! I have a lot I WANT to do to my car right now, but no $$$$ to do it with. My current job only nets me about $130/week BEFORE taxes. If I get this other job I've interviewed for I will be making $200+ a week AFTER taxes so I'll have a lot more "freedom" financially. Plus I should be getting a pretty nice tax refund this year.

SCCobalt951

Hey for those who have the magnaflow do I have to get the thing welded on or can i just install it myself by just unbolting the stock one and bolting on the Magnaflow?

BlAckOnBLaCK

Does anyone have a dyno numbers for the gmpp exhaust?

BLKSS

I would like to know also because im probably going along with GMPP.

leeserlee

do we know what "gains" the GMPP gets?

BLKSS

10 and 6 but no proof.

hardtocope

do you think the gmpp exhaust will sound the same on a 2.2 cobalt? also was that a performance gmpp exhaust or the touring gmpp exhaust?

CobaltSS422

What's the piping size for the GMPP exhaust?

codyss

I really would like to keep my SS all GMPP but, does anyone know if theres any truth to the rumor that GMPP is also going to have an exhaust made by Corsa?

Thank you Doc for the videos also. Those will really help anyone who is considering the GMPP exhaust.

Anyone here have the GMPP touring yet?

distillion

thats the sport right??
did you get the tip from GM also?

BLKSS

2.25

Doc

ok, I finally made it to the shop to get my car on the dyno. I gained 5hp from the GMPP performance exhaust.
BEFORE - 219.9
AFTER - 224.6

distillion

not bad i guess, any torque gains?

Doc

sorry, they didn't print them out, I went up to 196, like 4 or 5