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I drive a M5, I've been running mission performance stage 1 for 6 months now with just akra exhaust. I can tell you that with a stage one you can get a nice bump and not worry about blowing the thing up. The car feels smooth with no hiccups at WOT and like stock when you're cruising around town. With stage 2 you're looking at clutches, downpipes, charge pipes, intakes, tires for better grip, axles and diff mounts if you want to be in the 700+ which all translate to a LOT of money.
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