B5 S4 Noise Lower Boost
#1
B5 S4 Noise Lower Boost
Hey guys, I have a 2000 s4 with a MTM stage 2 tune. Car makes a "krrrrr" noise at wide open almost sound like air but very loud and can hear it outside the car. It spikes at 15 and holds at 12 now. What could be my issue? Thanks
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