The other option is to add another set of resonators before the X. I did and it cleans up the sound tremendously. The "fart" sound and drone drove me nuts.
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09 SG E90, Black on Carbon Leather, Tech, Premium, Cold, iPod, Premium Sound, 19s, OEM Alarm, PDC, Moonroof, Sirius
Eisenmann Sport / Eibach Springs / 35% F1 Pinnacle Tint / Macht Schnell Air Filter / LUX Angel Eyes / Black Grill / AA Pulley / Powerchip Stage II Tune / Fabspeed X-Pipe & HFC / RAC Monolites RG63
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