I've just taken my N75 J off as the ECU was cutting the boost back at about 5250 RPM in 3rd & 4th gear. (Throwing the code 00575 up). It's a bit of a weird one, TBH. I've had the J on since late January & have never felt an issue with it or had a code come up (in fact it pulled a bit harder lower down the rev range). Then a couple of weeks a go, when I fitted the new Forge TIP - it was pulling even harder, but then was cutting back the boost at high revs. I thought great............. The TIP isn't on properly. Did this quite a few times, but this was when I discovered the worn clutch. Anyway, clutch went in yesterday & I was still getting the 'dead spot' along with the 00575 code. I haven't touched the new TIP since I installed it, but put the N75 C back in this morning before going to work & the problem hasn't come back since.

Wonder if the J needs a little bit of a map fettle....................................................................
