Shaun Martens
05-19-2007, 12:29 AM
hey i was thinking about getting an HMF exhaust which series gives the most power gains on an almost stock 05 400ex.
almostred434
05-21-2007, 12:09 AM
sport series i think the bill balance edition comes with a torque range modifier
no idea what it does but
i think the sport series look the best too
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