Installed on a 2012 KTM 350 EXC-f. Even with this insert the bike is way louder than stock. If your goal is a more quiet exhaust the PMB end cap is probably not the answer. If you need a USFS approved spark arrestor but dont want to fork out for a slip on then yea its a pretty nice product.
Pro Moto Billet Ultra Silent Insert
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Pro Moto Billet's new Ultra Silent Insert further reduces sound levels with a reduction range of 4 - 6 decibels*.
Same great fit, finish, and easy installation as Pro Moto Billet's standard silent insert.
Fits all new style color anodized "cone" type Pro Moto Billet spark arrestor end caps (Endos).
Requires a Pro Moto Billet Endos spark arrestor to install.
NOTE: These Will NOT fit Pro Moto Billet's older style polished "snorkel" style end caps. (If your end cap is bright polished aluminum, then you have Pro Moto Billet's older style end cap.)
*Sound intensity level will vary depending on model, tuning, and exhaust system condition.