When I got this kit it didnt wotkbecause Scion changed the wire harness. I took the car to Greddy and they made it work. I have had some problems with performance and notice that they installed some small little 4 wire box that didnt come with the kit into the ecu/emanage setup. only one of the four wires are connected the yellow one. Well everyone knows you need atleast 2 wires so im wondering if anyone knows what im talinh about and some guidence and instructions would be nice.

what kind of problems have you had? did you get it tuned?