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gronk effect.??

hi lads, just wondering if anyone has tried, OR successfully carried out a "GRONK" MOD on a Harley Dyna, mine,s the 2007 model, is there a Cat. Converter in there , or can both baffles be taken out and drilled with larger holes, one for the "heads" surely.!!!:34:
 
Shouldn't be cats but I wouldn't drill out the baffles, it sounds terrible but ONLY YOU will like it only after it is done because it's done. Do it the right way and replace with slipons.
 
U wont like the sound of punched out stock mufflers save your self some time and buy some slip ons been there done that never again
 
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