To be honest i'm not sure. Best chap to speak to is Ben Linney from GTC. He'll probably be able to do you a good deal on a titan as well. But if its quiet you;re after a non-res titanium y-pipe coupled with a titan exhaust will not be the way to go. It;ll sound gorgeous but it will be LOUD!
Sold: White R35 2010 Black Edition
Current: R32 - Nur engined - KH2 - TE37s