Originally Posted by catm3
To me, crank numbers are worthless, and can be misleading. The E46 M3 and 335i put down fairly comparable rwhp numbers, yet their crank rating is 33hp different.
Lots of tuners quote a crank figure based off estimates. Good for marketing, but doesn't really give you a clear picture of power being made. I'd be real curious what the N54 puts at crank, stock. Probably more than 300/300. That makes Alpina's gains less impressive, particularly if they are using 16 psi boost.
If they are the stock turbos there may not be a whole lot of top end power to be gained from increasing boost before they run out of efficiency.