well i had the same problem and took it back one week after install (today). The mechanic told me doesnt matter what you do they will always squel spesh with skylines. I'm like hmm... ok. I left the car there for a dyno but next time i'll have to go somewhere else for brake stuff. I won't settle for "u can't do anything about it". Thing is they are a pretty respectible mechanic/tuner in vic thats y i went there. pretty dodgy, i booked last friday for service, pads, rotor machine and dyno. I asked what time, they said 5. I get there at five, had to wait for them to finish half an hour, no biggie. But i Could see the mechanics just doing a rush job on the car. When i went to pay: "I'm sorry we didn't have time to dyno ur car we were too busy with bigger jobs". i was like u could have told me and i would have left it till the job i asked was done. n e ways off topic soz. end rant...