Stage 1 & BTG Exhaust ...
I'm interested in hearing the difference between Stage 1 with BTG/aftermarket exhaust, and that of Stage 1 with the stock exhaust. Has anyone noticed a big difference? I suppose, what I'm getting at is, Stage 1 adds 20 HP, but with an aftermarket exhuast will there be a 30 HP difference from stock GT Turbo?
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