ideally, find a p13. i ran a gsr ecu, and it made more hp but less tq; however, it did run a little too lean for me to comfortable without the proper tuning i got along with it. right now i'm running a hondata p28. no butterflies- and while the dynoes are identical to the gsr ecu dyno, you can notice at low-throttle driving the lack of the torque that the butterflies gave. . . .