Boostmaniac

I guess the next question is who makes the 70mm header and are there any reasonable midrange gains to be had after tuning? I'm trying to play the long game here lol!

Scigheras

As far as I know, only Invidia makes a 70mm header, and that header is definitely NOT known for making any power.

DarkArsenic

i think gernby said that the best HFC he had in mind was a HFC that starts 63.5mm(at the header flange) and ends 70mm(or whatever diameter your exhaust is) to the exhaust. i think if you ask berk to make it for you they will for an extra charge, or ballade sells it as well. i went with the ballade one since you can also reuse the oem heatshield.