I would just have scotty do a pressbend exhaust. You can make 550whp through a 2.5 exhaust. A pressbend 3 will be plenty for what you want. I just used an apexn1 on the galant I just built. I used a 3 inch pressbend. No problem maxing out a 20g with it.
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want a piece of the yellow car? (buy it)
you have to beat the blue car first
and then you have to take on the IV
my favorite quote
"if the solution is simple, God is answering"