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Big Gun to loud, Cheap Fix?

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Recently my trusty 03 crf450 and I attended a race and I barely passed the sound test. I have a Big Gun quiet series that I recently re pack but I am still worried that I will fail a sound test.

I found these Big Gun Quiet Vortex inserts but they don't look like they do much. Has anyone had any experience with this insert? Does it work?

I found one on eBay for an example.

http://www.ebay.com/itm/Big-Gun-Exhaust-Pipe-Muffler-Vortex-Quiet-Core-Insert-/140642980570?pt=Motors_ATV_Parts_Accessories&vxp=mtr&hash=item20bef992da

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Ehh true but I race mostly enduros or grand prix's the 450 has got more power than I need. I just don't want to have to screw with jetting.

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