I say B16A (P30/P08) chipped.
This way the chip can increase your rev cut which e-manage cannot do.
This include speed cut form standard ecu.
Fueling/timing all can be taken care by emanage.
I have HKS Hi Power exhaust 3", which is a bit loud (not for me though)..
so, what's the best way to lower down the noise inside the cabin? I dont want to change the exhaust yet because I like the sound and...