I have heard ITR have a pretty good B-pipe. If I want to get an aftemarket exhaust, should I save some money by just getting the muffler? Or is there a bottle-neck to be elimanated by getting the full cat-back?

 

There are a few bottle necks on the stock ITR catback.. You will remove most of them by going with a full catback rather than just an axleback.. If you choose to go with a catback I'd suggest the Apex'i N1...

 

Are those bottle necks in the B-pipe?
How about the 5 zigen fireball?

 

Yup. On the b-pipe.

 

Then why so many people like the spoon N1 muffler?

 

I suppose just because 3whp isn't worth that much to them, and they either just like the Spoon N1, or they get an aftermarket B-Pipe as well.

 

I thought changing the exhaust in ITR alone won't have "ANY" performance improvement? Or is there 3whp increase?

 

Because they're riceboys like me. I mean it's SPOON!

ITR owners tend to flock to overpriced Mugen/Spoon/JDM items for some odd reason, at least we all track our cars though. Right?