Go with a 2.5" you won't need a 3 in. My recommendation would be to go with the zzp 3 in down pipe with the 2.5 in exit and then find a nice 2.5 in catback that you like.

 

And look at this thread. Hope it helps
https://www.cobaltss.net/forums/gene...-model-254160/

 

ied love to do that but the zzp dp only fits with a xxp cat back and they dont sell an 2 and a half inch cat back

 

who told you that?

i have a ZZP midlength Header and High Flow Catted DP (2.5 inch) with a Megan cat back.

 

hmm yeah Ive heard it fits some and not others, their 3" exit didnt fit my hahn either, but i drilled holes and made it fit. you can go with the 3" zzp cat back if you want, its only going to hurt you a little bit power wise

 

so u got a megan cat back on a zzp down pipe what sight did u get all your stuff at and do u like the sound is the down pipe 3 inch with the 2.5 flange

 

Megan, you could get from a couple places.

ZZP DP obviously from their website or used here on the parts forum.
The catted DP is indeed 3" with a 2.5" flange.

 

have you heard the megan?

 

yeah what are your thoughts and where can i buy a megen cat back or shouldl i stick with the zzp cat back but i dont think i need the 3 inch. and it put a down pipe on with 40k on the car will it be hard i live in pa

 

You could go on Google Shopping and find the best price for the Megan cat-back.

 

My last mustang had straight pipes for about a week. WOT = Earplugs....

 

do u think a i should do 2.5 down pipe and 3 inch cat back stock stuff

 

since u live in pa go 3inch catlless into a 2.5 exhaust and your gooooood. trust me

 

catless? he wont pass inspection

 

u dont live in PA otherwise youd know he would, all he would have to do is when he gets tuned turn off the cat codes annnnd he'll pass. wanna know why? because inspection doesnt require a "sniffer" nor do they have to look to see if one is there

 

You could copy my exhaust, people tend to like it

2006 Cobalt SS 250Whp/237Wtq Trickpro Motorsports Dyno - YouTube
Full exhaust! Bad-mab shorty header installed! - YouTube

 

what do u have and i dont have enough money to get a header and i want a cat i dont want to be to load and i dont want to sound ricey

 

ZZP 3in catted DP, bad mab header, ZZP 3inch exhaust with res and muffler

 

ok perfect now i dont want that header but i want that dp and cb i only have a intake did u notice any power loss will that be to big for me or what how easy was it to install

 

3inch is fine on an SC as far as I know, and no idea, I had them both professionally installed

 

hows the sound that vid sounds good but i cant really tell is it raspy or droney if u had to do it again would u get something different.. i a little gun shy on getting it. its a lot of money to put out

 

lol yes please try telling me I dont live in PA hahahaha. Jesus my bad. For some reason I was thinking there was a visual check.

 

thanks for your help i am going with the zzp 3 inch down pipe with cat and 3 inch cat back with resonator. i hope it the right decision.

 

and is there a way to unplug the o2 sensor and the whole wire and sensor can come off with the down pipe and i can take the sensor off the dp while the dp is off the car. do u know what i mean?

 

You can get to both clips of both o2 sensors in the engine bay.
I forgot which one was for the one on the DP, but you can unclip and it route it down towards the bottom of the car.
There's a HOW TO on here.