Oh and its also the reason that even HKS's top of the line light weight titanium racing exhaust is a y-pipe to single exhaust......just sayin.
The ARK grip does seem like a better design.

As Tony from Motordyne says is that the design of the y-pipe is key and that there are no scavenging affects after the y-pipe. Single or dual shouldn't really matter as long as there isn't any restriction. http://my350z.com/forum/intake-exhau...k-for-n-a.html

There is a dyno somewhere comparing a dual exhaust to a Nismo which is essentially a single with just a dual out muffler.

I really like the ark exhaust.. Sounds sick!!

I have the ARK Grip V2 exhaust.. It is a true dual cat back with the X pipe... I def noticed gains when I got it and it sounds amazing.. infact the sound got better over time.

I think I am one of few with it. I can't wait to get a Berk HFC put on it because it makes the already great sounding exhaust that much better!

haters.

Lots of good info...thanks for the link Jairen. I need to learn to weld, wanna make my own exhaust.

Looked in my buddies hks tonight and that pipe is not there it is smooth all the way through..

His is probably real.

Oh it is real.. he doesn't rock cheap fake stuff..

Rocking the fake stuff and lovin it!

Simple answer: Looks and the name. Hence why I prefer sticking to a custom exhaust.