Ok so as keen as I was for a trip down to Melbourne looks like im going to Australian Gas conversions in Wollongong they have been recommended to me by a few people including Mick at LPG warehouse, as far as what im after he thinks 280rwkw will really be pushing the system even with two fuel pumps and im better off keeping my top tune on petrol.. I am currently making 308 rwkw with the stock valve springs on top tune just 60lb inj and bigger intercooler with the flash tuner.. He thinks I will definately need to upgrade and was suprised when I told him I had no idle troubles at that power level.. what power level do you think you can tap into before doing the valve springs ratter?? im happy to do them if there is an advantage for them but at the moment car is running smooth as on top tune Cheers Liam