whats the piping size?

 

I maybe wrong, but I believe it is 3".

 

Y-pipe is 2.5" merged into a 3" collector. The rest of the exhaust is 3"

 

Why wouldn't you go to their website?

"2003+ Nissan 350Z Catback Exhaust (350Z-CBE) US$1,249.00
The TurboXS 350Z Exhaust is a high-performance, all 304 Stainless Steel system providing increased performance without the annoying drone associated with typical performance exhaust systems. This is due to the tuned resonance chambers in the vehicle-specific muffler design. For those that want to keep it even quieter, removable silencers are included with every muffler. Dynotesting shows gains throughout the rev range with peak horsepower gain of 10 wheel horsepower. The TurboXS 350Z Exhaust is available as a true Cat-Back system that includes the Y-pipe that is typically sold separately in competing "cat back" systems. The Y-pipe is a piece of fabrication artistry and provides a full 3" diameter system from the merge point of the two banks back. For the ultimate in performance, add the optional race pipes, turning it into a full racing exhaust system. "

 

ohh,so id be looking at losing some tq...?

 

This is not a true dual. It seems like you're thinking this is some 3in. true dual exhaust.

The Turboxs exhaust is just like stock except bigger diameter piping and less bending in the pipes.

 

oh nice, so ill see nothing bad. but some small gains

 

Joe search. There are dynos posted, and 10 pages of discussion.

The power is as good if not better than many true duals.

 

for $500 you cant beat the turboxs exhaust.