I've been doing a fair amount of research into what seems to be the top 3 or 4 tuners for the IS300 and am looking for your experience as to which tuner I should go with. There appear to be a handful of highly modded cars here on the board with no clear "best solution" yet. I'm looking to do either do a GTE swap on a new 03 IS300 or maximize the potential of the stock block with stronger internals. I would like to build a reliable 10 sec car. I currently own an 02 APR stage 3 S4 which consistently runs 12.3/116's on 104 but I'd love to walk a P-car TT, which today I can barely pull on (I'm also pretty much maxed out in terms of future potential on my current car). From your experiences, which route and tuner would you go with? What would you do differently if you could do it over again? Thanks for your help!