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I replaced the intercooler couplers, the exhaust gaskets, and installed copper lock washers from pineapple racing. I also turned the boost down to 10 psi until I get some form of charge cooling on the car.
10psi by 35-3800rpms, feels so much stronger now!
Glad you sorted it, makes my s5 stocker sound laggy now. What gear is 10psi by 35-3800rpm?