My Series2XRT was edited & tuned by KPM (gr8t guys) and it flies. Has done arround 20000ks and a has had a diff leak and spine problem on drive line. Makes a tinging type of sound when u gun it. Fixed under warranty. Currently running 8lb 95RON tune which is plenty to blow pre gen3 HSV's, you should see their faces Anyhow, according to Ford the spline noise has had a tech bulletin realeased and the fix is applying Locktight. The diff leak is a quality control issue. Unable to say if it is attributed to the edit. It is the old story, give anything mechanical sh*t, you end up paying. Treat it with TLC and it will return the same. One thing though, be prepared to relace rubber and regular intervals.