Hey guys My experience was similar to xoom's in that I started out fully building for NA power. CAI, mahle pistons, piper stage 2 cams, port and polish head, flat face valves, valve springs, titanium retainers etc. I was satisfied for a while with the cams addressing some of the torque that lacked in the lower revs but i still longed for F/I and that is the route I am going now. Back on topic though a few guys here in Barbados have the trd pistons and they run ok and offer some improvement on the stock ecu but bear in mind I do think we get resonable octane gas here (~93) and with high compression the quality of gas is an issue. P.S Cams were my best NA mod in terms of performance parts