Never a swap I would do. Going from one of the best cars of all time(let alone one of the best BMWs of all time) to one of the worst they have made. HPFP failure, turbo failure, lag, direct injection carbon buildup, E90 interior and build quality, E90 exterior, and the general feel.
All that for a bit more speed in a straight line. Count me out.
Andrew
Current - '05 Interlagos on Cinnamon E46 M3 6MT Slicktop Coupe
Sold - '10 E82 M-Sport 6MT Slicktop Coupe
Sold - '85 Black on Black 911 5MT Coupe
Sold - '03 Lemans on Lemans E39 6MT M5
Sold - '99 Kosmos-Schwarzes on Dove E36 5MT M3 Coupe