Sounds like a good plan with the engine, they sound amazing as well. Definately do another thread won't you? And show turbo bits etc With your wastegate... Was it a slight loss in power you mean? I had a bov on my old vrt and between gears it had big hesitant in power but changed to external wastegate and had no lag between gears after that. Yeh lots of different people on the track, some shouldn't be aloud on there! As you might have found out on the tracks you've been on? I thrashed my 535d round there