I agree with Phill that the GW is too expensive and they are trying to recoup all their R & D costs by passing onto end user. The other system being developed with a Turbo option is based on Megasquirt EFI which is an open source DIY project. Not may tuners are familiar with this system here as most use Haltech. Seems very well suited to the application. Reported to work very well on air cooled VW's. I spoke to some tuners at the last Valla and they swore by it, and said it was the way forward. Think double the HP for the Turbo option and increased drivability for a non turbo option. Not that I'm an expert or anything. Its cool that people are inovating. He will use microsquirt which is used on Jetskis so no probs with H20 ingress on the system I expect it to be reliable. I looked into it but it was too much of a learning curve for me to get my head around.. If people are looking at better power and fuel consumption and bang for buck, then I think we need to look at sourcing a local maker of Stainless Exhaust systems like the quality ones that Rocky Mountain Westy and Vanistan produce. Its an expensive to upgrade if your EFI aint broke, and it may not produce concrete power and efficiency gains - (non turbo) but the SS 4-2-1 exhaust will.