Hi, I need your comments on the Ractive Headers for a P5. Dyno tests, quality, reliability, sound. I'm really new to "headers" and I don't want to buy craps or pay for nothing.
I have a mazdaspeed exhaust, and i'm planning to keep the second cat.
What about keeping the VTCS as it is on a P5 with an MP3 ECU? Do I have to remove it or something like that. That doesn't seems to be verry clear for me.
Is there any way to have more gain.