agreed on that. 2.5 is more than enough

 

zzp header and dp with 304 stainless and 1.75 primaries it's 509 which is pretty damn good IMO... with cat too ...


what are you're plans? if you're plannin on staying NA i'd go with 1.75 primaries and a 2.5" catted DP smooth flow... but honestly then the gmpp exhaust might be choking your flow a little bit... your exhaust is only going to flow as good as it's most restrictive point.

but yea ZZP all the way IMO the quality looks awesome and it seems to have some good gains and it's a good price... outside of that i'd say vibrant but thats a bit more expensive, or maybe CTI but i don't remember what people have said with that i know someone with a vibrant header DP package and it's awesome and from what i hear the ZZP is awesome and they have good customer service