Hey, im after a perfomance chip for an series 3 AU on gas i was wondering what the best way to go is.

Gas is more like a carby setup than an electronic fyuel injection. the ECU and that doesn't controll it, they use aftermarket chips for a few basic functions from the LPG kit, but that's it, Unichips and things like that won't give you anything more. Spend the money on a cam change, you can run liumpier cams on LPG thawith ease compared to petrol.

Arent the ignition curves different for gas??
So thats something that could be changed for the better, and match that up with a bigger cam!!!