Awesome. im running zzp long tube header with catless dp and zzps 3" exhaust with resonator and muffler, both magnaflow units. the kit looks excellent and fit well. most of all though its remarkably quiet. im serious, i expected that going from my gmpp exhaust with a 2.5" flange to a full 3" inch exhaust with a straight through muffler that the car would be pull me over loud but thats not the case. car has a very deep tone and roars when you floor it. my thought is the magnaflow resonator is the *****. it used to burble quite a bit when i let off the throttle now theres a mellow rumble when i let off.
Side note the car seems very happy with the extra breathing room. she used to have a bit of vibration at the top of second and third right before the shift, thats completely absent now. its smooth power right to the red line. not sure if she lost any bottom end torque because any attempt at full throttle off the line results in shredded tires. im due back at the dyno for a SMG installed meth kit ill see if i can get a before pull in to see what it was worth in terms of hp/tq.

 

thats weird cause i have the exact same set up and mines louder than most hondas with straight pipes

 

Same here. I got bad mab, and 3" zzp dp and catback.. Super loud and I ******* hate it

 

And raspy as all hell

 

nope, a deep mellow rumble. ill be at the car meet in worcester tomarrow if anyone wants to hear it otherwise ill be at the mod day on sunday.

 

mine had a deep mellow rumble to it as well when i was stock...and now its jus a bit deeper with a bit more rumble

 

I just put this exhaust on my car as well but I went with the ZZP in house made chambered muffler. It sounds really good and it isn't raspy or loud even with ZZP catless LT.

 

My 3" ZZP sounded like ass that had been fed boiled eggs and vinegar, traded it to darkchild and the first thing he says to me is it ain't that bad...

YMMV, Zach likes it.

I thought it was horrid.

 

 

ZZP 3" Catback on Cobalt SS/SC - YouTube

 

Mine, sounds like great sex on video but DD not so hot:

2.4L Cobalt SC w/ZZP Header and 3" ZZP exhaust - YouTube

 

how do you not have any cel with the zzp header.

 

What?
If you have a CEL after a header install, you did something wrong.

 

In all my modding, I've yet to throw any cels related to intake or exhaust.

 

Well I think my car just hates me. I have P1133. Haven't gotten a tune yet, but replaced the upstream o2 sensor. Came back 2 days later. oh well. I installed the ZZP Lt header with dp. I also have the injen intake, but that was on a couple months before hand.