i was on the zzperformance.com n i was wondering if the header thats under
ZZP stainless ecotec shorty header will fit my 07 2.2 cobalt Lt?

 

yes it will.

 

will it make the car sound louder?

 

it shoudl fit as long as you don't have sai on your car. if you have sai it will not fit. if you don't know what that is, look at the sticky at the top of the 2.2 section.

as far as noise, yes it will make it louder.

 

I doubt it will make it louder, it might change the exhaust tone but thats it, if you want louder, catless downpipe and a catback or fart can will do that.....