i agree with whitecrystal. mine's been on for 2 years and not a prob, although no real gains IMO. i want to get it dyno'ed this summer to see. i do sometimes get a belt chirping sound if i get it revved out in 2nd. it seems that the rev limiter has been reached and accelleration stops, until it shifts to 3rd. but i have f*cked with the rev limiter and shift points.
13 Eco screw with FX4 and 3.55 E locker