I have in my 997 4s cab tipt.with ecu from softronic a KN free air filter and for exhaust the PSE and i am thinking to put cutbacks from APR.What is your opinion about the power inkrese that i have if i have any and about the sound because i like to have low sound in no sport mode i am afraid that it will be to loud...and adout the sensor lamda if i am going to have any problem?Does any one have put the APR?