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As mentioned above, stock turbos on e54 here in AZ seemed to be the perfect spot for the track.
I recently just did crank hub & pure turbos. After getting a new custom file dialed in I decided to attend a track day before Bimmerfest.
The car on Pures is definitely a handful, if you told your tuner to tune for high hp/low tq this may help you out. Once the tires got warmed up the car did decent (NT01's 275/305).
If you plan on just tracking the car my advice would be to stick with stock turbos w/ a nice custom tune for low Tq & some good tires
Hope this helps!
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