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 w/ just boltons
'09 Z4 sDrive35i w/ just boltons