Quote:
Originally Posted by kosstick
Updated OP with the kit I have.
This issue occurred when we swapped to the ark exhaust from
Invidia (which was more restrictive). We have also swapped the pulley to a 92 mm one but the sharp decline started once the exhaust was swapped out.
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weird, i swapped my HKS out back to stock without retune and still runs the same.
did you retune it after the pulley change though?