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The Dyna stock slip-on will not sound good compared to after market slip-ons. No driling/punching gutting or what ever will do it. Compleate gutting take hours and the loss of back psi make them do little more than make noise.
Knock out the pulgs is the best way to go. You keep some back PSI and they sound good enought till the $70 dyno power slip-on get ordered. Its easy too.
 
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