Is a USDM ITR B-PIPE 2.5 inches I.D.???

no, 2.25 with a couple bottlenecks thrown in for good measure.

what BRAND or kind of exhaust do i have to buy for my )! GSR for it to be 2.5 inches no bottlenecks?? I have JDM ITR Collector header and smsp 2.5 inch cat

BUMP
ok if i buy a 2.5" catback for a gsr its bottlenecked to fit the 2.25 " catalytic Right?? so which exhaust is most cost effective to get 2.5" no bottlenecks and resonated, exhausted sound from???

SMSP offers full 2.5" cat-back exhaust kits with no bottle-necks. You can choose the resonator and muffler combination you prefer to achieve the sound you want.

Kteller.com also offers similar 2.5" cat-back kits that many people have reported good experiences with.

thanks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nortrop &raquo;</TD></TR><TR><TD CLASS="quote">no, 2.25 with a couple bottlenecks thrown in for good measure.</TD></TR></TABLE>ITR piping is 60mm. There are no inches in Japan. THE METRIC SYSTEM MY FRIEND...60mm=2.36"

While many JDM aftermarket cat-back's are 60 mm, the stock USDM ITR exhaust is 2.25" (57 mm) OD. I've confirmed this myself on several occasions using calipers.