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DB DAWG - "4Stroke Quieter" Insert
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[QUOTE="Rich Rohrich, post: 1171352, member: 16241"] I think the reason you don't see much about this has to do with the basic engineering of devices like this. Plugging up the exhaust will certainly quiet the bike down but it also has a huge impact on system back pressure and how the engine reacts during the critical overlap period of the cam timing where both intake and exhaust valves are open at the same time. Late model four-strokes designed for high rpm running don't take kindly to big increases in backpressure, so while it most certainly will work at changing the sound levels it will do so at the expense of engine performance. For some folks the performance hit versus sound trade-off is acceptable, but I'm convinced that most riders would GLADLY ride a quieter bike if they didn't have to do it at the expense of response and overall performance. Unfortunately simple restrictor devices like this won't cover both requirements so I don't expect a mad rush to buy this type of product. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
DB DAWG - "4Stroke Quieter" Insert
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