Hi all, First time poster, long time lurker..... I have a problem with my 08 plate Audi A3 S3 which is totally standard other that a GIAC pump map and flash loader, 28k miles, regularly dealer serviced. The problem manifests when I am using the pump map and I am applying light throttle at low to mid revs (2500-4000) especially noticed in 3rd/4th gear. Then when I accelerate hard (no gear change) the engine revs surge for a moment by ~500rpm without that power being felt in the accelleration, before dropping back and following a pretty normal power curve up through the gear. It seems almost as if the clutch is slipping momentarily, or the wheels have spun - but there is no esp indication and the gear seems normal other than the momentary surge. There is plenty of power being transferred when it does get to the wheels. Also I cant recreate the issue on the standard map. Please note that the dealer is going to be changing the rear axle/diff/haldex/oojamaflip under warrantee so hopefully its connected. Anyone have any ideas what it might be? I am going to speak to Regal who I bought the map from, but experience and suggestions appreciated.