So I am looking to reach around 250-275 bhp. How would I go about doing this in a reasonable way. Is tuning the answer or is it more in depth.
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You won't get there with the J30A1. period.
We swap in a mild build J35A3/A4, some guys use the J32A2. Then you can run a piggyback or stand alone.
But then you need to either swap in the 5-speed auto tranny or a 6 speed manual to match the HONDA ECU running the engine. You won't be able to use the 4-speed auto with the HONDA 5/6 speed tranny ECU's. The 4 speed tranny won't run 100%.
So yeah, it's a drivetrain swap or nothing.