[m5james]

This still begs the question...was AA's tune the same canned tune for anyone vs being custom tuned for those turbos? This isn't a new thing yet easily forgotten that just about EVERY substantial mod like that requires a custom tune to actually utilize it fully. I've yet to see a single tuner for the S63 actually say they've got a tune that is anything more than stage 1 (stock car, just a little quicker) and stage 2 (catless downpipes, maybe mufflers). Until I see a tuner say a special stage for custom turbos like on the N54, I think this is only telling half the story as to why it doesn't feel any different.

If you want to go faster than tune and DP, I say go JB4 first before going turbos. The power from stock to flash was a jump, the power from flashed to stacked with JB4 was a leap.