I have a series one ba t manual trans.what sort of rwkw should I expect to make using a xcal 3 ,it has a walbro pump,968 injectors, cold air ind,big intercooler,.8 gapped plugs,k&n filter I dont want massive power but id have to expect up to 280rwkws ,am I right?,id like your opinion. Car has low kms and is looked after ,id like to get this without upgrading valve springs but I will be doing it at a later date,and prob another tune.