I have the GMPP performance exhaust. I want to buy the ZZP header/dp combo, will it fit if I get it with the 3" dp and 2.5" exit? Or should I just get the 2.5" dp?

 

I too was wondering this!

Are you getting the ceramic coating on the header? Also, are you getting a catless DP? Just wondering.

 

That's exactly what I have on my car and it fits perfectly!

 

wich one do you have

 

No I think the ceramic coating is pointless and yeah Im getting the catless dp.

 

My Ceramic coating is starting 2 rust...and its only been a month.

 

What header do you have?

 

I have the zzp header and downpipe combo.

 

i have the midlength header with 3 inch downpipe with the 2.5 exit it bolted right up to my gmpp and love the sound!

 

that's exactly what i have. not sure if it was ceramic or not, but i dont think so...

 

i maybe wrong but if your exhuast goes from big to small want it hurt your cars performance

 

in theory it could create some turbulance in the exhaust flow & cause a decrease in performance..

Translation: Its stupid to go from 3" DP to a 2.5" cat, and serves no purpose other then to make your exhaust louder

 

that is probably true and i dont have too much experience w/ different exhaust combos, but i thought of it like plumbing or electricty... you start with a big pipe or wire and it gradually gets smaller the further it gets from the pump or power source. so it seems that it would be more beneficial to have a better flowing heading and dp, than a catback... this could be completly wrong but this is what i have been keeping in consideration while doing my exhaust.

 

Well let me know if having a bigger header and dp than catbakc will hurt performance. If thats the case then Ill just get the regular size.

 

my performance went up. a noticble amount.

 

i talked to zzp and they said it was much better to have a bigger header and down pipe going into a smaller catback. somehting about thermal something and i cant remember but i was asking a few things here and there and thats what they told me would be the best setup for now in my car

 

get it man. you wont regret it.

BUT! just remember to replace the bolts they give you.

 

Why whats wrong with their bolts?

 

They tend to be a bit weak and can snap when you tighten them. Finding replacements at a hardware store should not be hard at all.

 

Well I ordered it today. I got the 1 3/4" header, and 3" to 2.5" dp. I didnt get a cat so I hope it doesnt sound ricey.

And I asked the guy at ZZP and he said that you cant loose power at all by going from big to small. All it does is act like an air pocket which takes one billionth of a second to blow the air out of it so it wont hurt power at all. Its all about the velocity of airflow out of your exhaust.

 

I got my header/dp last week but i didnt get the header gasket for it so I have to wait until next saturday to put it on.