Picked up a Cobb from Jeff and installed it along with new plugs I had gotten. I've got serious traction problems on Cobb S2+F Aggr now (Michelin PSS 275s in the rear) where I didn't with the JB4. Awesome price and fast delivery! I need an LSD now, thanks Jeff!
'08 E90 335i 6MT. VM 6466g2 kit. Stage3+ Fuel-It with FPR return, BMS PI injection, undergoing widebody treatment
'09 Z4 sDrive35i DCT, MHD Backend flash, JB4, DCI