I have a stock WRX & find the exhaust noise in the cabin is just too loud, especially at the very beginning of the gear range (2000 - 2500 RPM). I have been told to add a resonator, but have seen mixed reviews on that. Any suggestions on how to quiet down the exhaust noise? I am not a DYI & will not spend 3K to soundproof the car. Please don't tell me to turn the radio up...it already sucks. Any suggestions will be appreciated.