got a r33 gtr with power fc, thing was pullin 257kw at the wheels then the next time got it tuned they had to bring it back 9 degrees cause it was pinging of its head. so as a result not getting i was much power now its pretty much back to standard. not naming anyone but when i asked what was the reason for it, i was told that they didnt no:-( its still driving ok from what i can gather but just wondering if anyone has any opions on what might be going on?
going to see someone about it next week but would mind gettin a few opions as i have not much of an idea. thanks:-)