Fatbooty...i remember you said 2.5" and swore by it...for a B20vtec hybrid with a b18c JDM Head and 4-1 Mugen header.... i have a 2.25"...is this suffice?...would this create a bottleneck at the mid-bottle...FYI, I have taken out the cat-back....

 

To add more, my mid bottle inlet is 2.25: and outlet at 2"...the pipings are 2.25" all the way...the muffler is 5Zigen Fireball...

 

Hmm, well I'm not sure what exactly is available where you are.

The '98-'01 JDM Integra Type R has a header with a 2.5" collector, and a full 2.5" exhaust. The cat is 2.5" as is the piping. Anything designed for that particular car will most likely be 2.5" piping.

 

I have since put in the CTR int and exh cams plus the SRR cam gears, tune it with my APEXi VAFC...concerning the head, is a B16B/16A be together with a 70mm TB be a good combi with the B20B bottom?...i am trying to budget as much as i can...thanks

 

the LS throttle cable will work with the ITR TB.