chrisv8321

I just purchased a zzp catless downpipe for my 08 turbo. I'm not really interested in doing a catback exhaust. What will I need to connect the 3" dp with the 2.5" gm catback? Probably a simple fix but I am deployed and can't physically look at it, so if you guys can help me out I will have it together that much quicker when I get home.
Thanks

chrisv8321

Or does it match up as is?

MS3 2 SSTC

It's fairly easy! Did mine in about 45 minutes. No problem bolting up to the stock catback! Here's a how to ......

https://www.cobaltss.net/forums/how-...wnpipe-233857/

chrisv8321

Thanks, so no adapter needed?

MS3 2 SSTC

Just the knuckle adapter so you can reach the bolt that's on top. That ones a pain in the ass to remove!!

chrisv8321

Anybody have their car dynoed before removing cat and after? I'd like to know exactly how much hp to expect.

Thank man appreciate the quick answer.

MS3 2 SSTC

No problem man!! You might get about an average of 10-15 WHP from going catless but without a tune, the learn down feature wont allow you to enjoy the added power.

chrisv8321

GMS1 gets rid of learn down pretty sure.

Raises parameters just like an aftermarket tune.

MS3 2 SSTC

Yes it does! But an aftermarket tune like HP Tuners or Trifecta is better. I had the GMS1 for 2 months then I added a Trifecta tune over that and holy cow!!! It was like night and day.

chrisv8321

So 10-15 with that?

MS3 2 SSTC

That's about right from what I've read here! I personally did do a before and after when I added my catless downpipe, but I felt it on the butt dyno! LOL

chrisv8321

Awesome thanks again.

MS3 2 SSTC

No problem man. Stay safe out there!! (read you were deployed)

ramrod1337

iTrader: (1)

I actually just did these mods on my gms1, didnt notice a big difference mainly just sound i should be tuned before too long so that should change things

chrisv8321

I'm sure I would prefer a different tune just feel safer with the gms. It operates on similar concepts as the aftermarket tunes so you should have noticed a difference.

chrisv8321

I'm not sure how they effect fuel mixture and what not, but I know as far as air flow goes gms and aftermarket tunes basically just raise the maximum airflow to a level that could never be reached.

gotboost?17

iTrader: (46)

nice choice, will bolt up but might get a cel

chrisv8321

From what I have read it seems like some people do and some don't. I guess I hope I'm just a lucky one.

chrisv8321

How much of a difference does charge piping make? Already looking for the next purchase haha.

chrisv8321

Ended up buying mpx catback just didn't seem right leaving stock on there haha.

chrisv8321

Bought injen charge piping today too. I should probably quit buying things for the day.

MS3 2 SSTC

Nice choices there man!! Just enjoy the money man cuz once you're tied down, you'll always be bitched at! Well I do

chrisv8321

Haha I am married, but as of right now I make all the money so she doesn't complain. When I get back from deployment different story. Good thing as of today I got all the mods I wanted haha.

MS3 2 SSTC

lol