Test Notes

Engine S85 5.0-liter V10, dohc, 40-valve Transmission Six-speed manual Mileage 6,000 Current modifications Forgestar wheels Dynojet 424x Temperature 72-80 F Test gear Fourth BRSELINE (Sport mode) Peak power 445 hp 7700 rpm Peak torque 336 lb-ft 6200 rpm 4000-8000 rpm dyno acceleration 6.35 sec. Temperature 72 F The most time-consuming part of this test was getting a baseline. The M5 was factory-equipped without a traction control-delete option, initially making dyno-testing impossible....

Testnotes

The improved throttle response is immediately noticeable otherwise the car behaves as stock. We witnessed a few degrees of ignition advance at the top of the rev band, as indicated by MKC's OBD-II scanner. The extra revs will further help acceleration over stock because you can now stay in gear longer, and see increased revs into the next gear. And in a car with a wicked top end like the M5, acceleration numbers will improve. While the only drawback involves the time shipping the ECU to...