LamboPete has posted some dyno results with the M5.
Dyno results are as follows:
Max HP and Tq at stock: 417.2 HP and 291.7 Tq. at the rear.
Max HP and Tq WITHOUT filers: 426.1 HP and 296.9 Tq. at the rear.
http://www.m5board.com/vbulletin/sho...t=66688&page=4