I'm looking for a cat back for my 98 ITR. I have a jackson racing supercharger (8 psi), so I would like to go to a true 2.5". All the ones that I have looked at are only 60mm and taper down to 2.25" to bolt to the stock cat. I've ordered a Kamikaze header with th 2.5" collector and would like to go 2.5" all the way through. Any suggestions?

Also where can I find the flow rates that some guys refer to? And how can I tell if a muffler is a straight through design. The manufacturer's web sites that I have scanned don't provide a lot of this information.

Thanks for any info.

 

Type 1 Racing has a true 2.5" exhaust and they are not that expensice either. Also, I'm not sure about this, Tanabe Racing Medalion might be 2.5".

 

T1R, Buddy Club, etc...

 

Who makes the ETC? I've never heard of them.

What about the flow rate info?

 

My suggestion? Build your own. That's what I plan to do using pre-bent mandrel bent 2.5" tubing sections like those sold thru JCWhitney, Sumitt, etc.

US muffler manufacturers like Dynomax, Magnaflow, Borla, all sell straight thru mufflers that flow very, very well.