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      02-09-2013, 04:17 AM   #43
B1gB0x
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Drives: M5 F10
Join Date: Feb 2013
Location: Atlanta

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Hi
a tuning friend from russia told me something interresting about the m5 from hartge

there was a m5 full tuned from hartge tuning box new downpipes new exhaust system and hartge said it should have now 690hp.
in the evening he drive a race against a m5 from another company with only ecu tuning for 620-640hp and they equally fast.