BMW tuner G-Power has announced on our facebook page. Their Stage 1 F10 M5 and F12/F13 M6 kit is good for pushing the V8 bi-turbo S63Tu engine to 640 hp / 575 lb-ft torque (780Nm) .
This is a +80hp / 74lb-ft gain over the new M5 and M6's factory 560hp ... CONTINUED
12 years ago