well i think i'm going to stick to tuning over at performance factory actually. jeremy the owner of the shop just got half way done tuning my buddy's single turbo z. we're running a very similar setup on the xfire and the z as mentioned above, just different fitment issues and motors. but. on a single turbo stock internal hybrid turbonetics turbo 350z we got it tuned down to 450 rwhp, keep in mind we're only half way done with the tune, but we started at 350 whp base tune first run. this is about the fourth run we've done. so we're looking at around 550 whp by the time we're done tuning his car. this is the reason i will be tuning at PF. I think i'm going to run a greddy emanage for the basic air/fuel tuning and monitoring and then having a computer chipped in and remastered to tune the setup to run hard on stock internals, that, and reliable.