I found this that might fit the M54 Z4s (there should be little adjustments required)... I'm already gonna call NickG in regard to some tuning for my supercharged Z3 so I'm gonna ask him... I'll report back...
The price is comparable with the ESS twin-screw (slightly cheaper IIRC), but you get the tuning from a premier BMW FI tuner... I doubt it's CARB approved, but if you take a look at the E46 pix, you can barely see the kit (if it wasn't for the IC), so given the retards that normally do the test you might pass the visual inspecion...
The price is comparable with the ESS twin-screw (slightly cheaper IIRC), but you get the tuning from a premier BMW FI tuner... I doubt it's CARB approved, but if you take a look at the E46 pix, you can barely see the kit (if it wasn't for the IC), so given the retards that normally do the test you might pass the visual inspecion...