Post by
RicerX »
https://forums.nicoclub.com/ricerx-u125542.html
Fri May 04, 2012 7:20 am
If you do a header on the 2.5 (say, Stillen ceramic coated catless header)... it will do WONDERS for a lot of things. I did one on my B15 Spec V... that is by far the best performance mod you can get for the QR25. I had a catless header, stock test pipe (includes a cat that isn't monitored by the ECU - don't know how the AC is setup) and an Apex'i WS2 catback. The car growled a lot more but wasn't really all that much louder. Gas mileage was a good bit better on the interstate at cruise - I managed 34.2mpg overall on a 7 hour trip from BFE, Mississippi. I was running the stock intake too.
I don't know how loud the Nismo is in person, but if you have a test pipe with a cat in it, which I think you do, it won't get all that much louder... just a bit deeper in tone. You'll get a chunk more power too. Kinda like the y-pipe in the 3.5.