Ordered EVERYTHING today!
Thread Starter
Senior Member
Joined: 08-02-2011
Posts: 447
From: Chesterfield Indiana
I didn't see it mentioned, but make SURE you get the Tbolt clamps with the IC piping kit. Better to do it right the 1st time than have a hose pop off under boost and redo everything. One "extra" thing you may want to consider: get a 2 1/2" to 2 1/4" reducer silicone coupler and use that at the intercooler to lower pipe connection. It's extra insurance that the connection will stay put and not blow off under boost.
Senior Member
Joined: 07-04-2008
Posts: 282
From: Jacksonville, FL
Yeah, i picked up one of the catless zzp downpipes with angled bungs today myself...should be in next week. I am going install it myself...
Hopefully, Trifecta tuned after the first of the year...
Hopefully, Trifecta tuned after the first of the year...
Senior Member
Joined: 05-18-2010
Posts: 313
From: Roseville, Mi
For you guys that ordered the ZZP downpipes... Before you go bolting it up, check the O2 bung for extra material just before the threads. Install the sensor before you install the downpipe. Mine had a problem with a little excess material left around the inside of the bung. The O2 sensor would only go in about 25% of the way. ZZP said they only had a couple of Cobalt owners report this. Instead of taking it out, I spent 20 minutes grinding out the excess materal with the downpipe installed. Just a heads up for you guys. 
Dave
Dave
Thread Starter
Senior Member
Joined: 08-02-2011
Posts: 447
From: Chesterfield Indiana
Just got back from getting the downpipe installed.
It really made the car sound alot different...much deeper...and it kind of "hisses"....sounds awesome
BUT....I haven't been able to tell how good it runs with the DP because the car is running (boost) is so jumpy....it just won't stay boosted on a certain PSI. Hopefully, when hell freezes over and I get it figured out...I'll be able to see how the new DP feels
It really made the car sound alot different...much deeper...and it kind of "hisses"....sounds awesome
BUT....I haven't been able to tell how good it runs with the DP because the car is running (boost) is so jumpy....it just won't stay boosted on a certain PSI. Hopefully, when hell freezes over and I get it figured out...I'll be able to see how the new DP feels
Senior Member
Joined: 04-03-2009
Posts: 707
From: atlanta, ga
i know that there are plenty out there that never have had an issue with gms1 but i am soooooooooo glad that i never went that route. every week there is someone here or on css that starts a thread like this one. hopefully the plug and play adapters that are out now will help eliminate so many of these issues
once you get your issues figured out you will be happy