I am planning to get this exhaust GMPP and want to do a downpipe at the same time. I am planning to go with a 304 SS ZZP with a cat. Should I get a 2.5 inch or a 3 inch? I plan on doing a top swap once I get a few other supporting mods done so I am thinking 3 inch would be the best. Is this going to cause any problems while I am still running a N/A setup? Also will a 3 inch bolt onto this exhaust or will I run into a problem there. Any help would be apprecaited

 

Even with the top-swap I would probably go ahead and do the 2.5.

 

Even though I have a supercharged engine, I decided to go with the 2.5 pipe cause I'm not doing headers, PLog or custom exhaust (My SLP exhaust is 2.5) so I didn't want to create turbulence.

 

Thanks guys. You saved me $10

 

If you are purchasing that exhaust system, I would get it through summit racing.

http://www.summitracing.com/parts/NAL-12498617/

I tried to buy that exhaust from GMPartsDirect Dec 28th, and when January 29th came they still didn't even have it in stock, so I canceled my order and summit-racing had it (cheaper after shipping) and it delivered in 4 days.

Save yourself a few bucks and a lot of headaches.

 

I actually got mine through my GM dealer. They gave me a really good deal on it and there was no shipping! Picked it up the other day, now I just can't wait for spring to put it on.