Hi! I own w209 clk 500 and have deleted my muffler and resonator, also modified exhaust to quad pipe exhaust. The car pops and crackles a bit when i take my foot off the gas at some rpms and when i slightly press the pedal after letting rpm drop. But the pops are veeeery quiet. Any ideas how to make them louder? Ive read that downpipe does the job maybe? Does anyone have earlier experience with same engine w211 or some other model? Thank You!