It is an astra g van with the c20xe engine in it.It started life as a diesel and it still has the original gearbox in it.I dont think this would help the 0-60 time.Having a new exhaust on it anyway and it will have the ecu chipped soon.was going to have the head polished n ported,been told the cossie head is best though.do you know how to tell the difference between them??? also I want to convert drums to discs on the rear,do you know what will fit or do you have to weld on brackets and stuff to make things fit on my van?