Fitted a Kufatec valve controller to my Rs4 and at 2000 rpm it booms like mad when on the motorway cruising around 70 mph and pushing on. What can I do to the exhaust
To switch it out ?
Anybody had the same problem and what did you do to fix the problem.
Valve controller fitted
2.9 V6 24v TFSI - 444 bhp
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