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Its all about the aerodynamics of the car.
By Ryan. H
a drz 400 supermoto is not a car. some kind of full race exhaust. most of the guys are modding the airbox (look at how small the intake hole is) by cutting it. 3"x3". then definitely a dynojet jet kit for the carb, and if you want more top end, a smaller rear sprocket. last one i did dyno'd at 40 hp, 40 lb/ft. topped out at 102 mph, downhill.
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