I had no clutch slip with the standard tune, however with an 8 psi generic edit the clutch would start to slip at around 2800 rpm in 4th. This was not related to launches or gear changes. Going back to the standard tune the clutch worked as good as new. I have since added a Mal Woods option 1 clutch. This is much better to drive than standard and seems to be copping with a custom tune.