I can't seem to find much detail info on the pipe sizes of the exhausts for the G35C. I'm interesting to see what's the pipe size of your exhaust. Please post what you have and your feedback on it.

These are al the info I have. Please correct me if the info is wrong.

Apex'I N1: Pipe size: 70mm-80mm - Tip Size: 60mm x 2
Apex'I WS2: Pipe Size: 70mm-75mm - Tipe Size: 60mm x 2

Greddy EVO2: Pipe Size: 60-70mm - Tip Size: 115mm Single Round
Greddy SP2: Pipe Size: 60mm - Tip Size: 115mm x 110mm Single Oval

HKS Hi-Power: Pipe Size: 60mm - Tip Size: 120mm Titanium Adjustable - True Dual Exhaust

Magnaflow: Pipe Size: 2.5" - Tip Size: 4" slash

Injen: Pipe Size: 2" - Tip Size: ?

Stillen: Pipe Size" ?? - Tip Size: ?? - True Dual

Fujitsubo: Pipe Size" ?? - Tip Size: ??

etc.

60mm = 2.36"
70mm = 2.75"

The reason I'm making this thread is to determine what exhaust would be best fit for the FI application later on. For stock application and simple bolt-ons for NA purpose, I see that 60mm pipe size is decent. However, for FI purpose, we'd need at least 2.5" diameter per pipe to be able to achieve maximum gain. Therefore, though I see that the HKS is nice and all, it's the least favorable for max gain compared to others with larger diameter?

 

btw, can someone please tell me which of these exhaust are True Dual and Not utilizing the Y-Pipe