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Apr 28th, 2007, 03:26 AM
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#1 | | Newbie
Join Date: Apr 2007
Posts: 3
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has anyone drilled the end caps of the mufflers for better sound, and if so does it harm anything else? | 
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Apr 28th, 2007, 01:52 PM
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#2 | | 200+ posts and climbing
Join Date: Jul 2006 Location: Georgia
Posts: 265 Model: '05 Heritage Interests: Riding, Shooting, Grandkids Occupation: Retired
| I had the stock mufflers drilled out until I knew what pipes I wanted. They just ran a large drill bit up the tail pipe and they sounded much better. In fact, I liked the sound of them better than what I have now. When that was done, I also installed a high flow air filter and had a new down load to the ECM. It is not advisable to increase the flow in the exhaust without balancing the input. | |
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Apr 28th, 2007, 04:35 PM
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#3 | | Moderator Has posted 500+
Join Date: Jul 2005
Posts: 4,073
| this is what i have done to mine.......06 eg....k&n airfilter for stock cleaner....6 extra 5/8 holes in back and bottom of aircleaner for more air...jetted the carb...mufflers....remove and drill out inlet end 15/16.......reinstall and start drilling out exhaust end a little at a time....keep checking plugs and milage....i ended up with 5/8 hole in exhaust end....ya got to keep some backpressure for preformance.......your milage may vary....that being said, when i do go with slipons it will be trapps....but this will have to do for now.... | |
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Apr 29th, 2007, 03:42 AM
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#4 | | Newbie
Join Date: Apr 2007
Posts: 3
| Quote:
Originally Posted by Slimjim  I had the stock mufflers drilled out until I knew what pipes I wanted. They just ran a large drill bit up the tail pipe and they sounded much better. In fact, I liked the sound of them better than what I have now. When that was done, I also installed a high flow air filter and had a new down load to the ECM. It is not advisable to increase the flow in the exhaust without balancing the input. | Thanks for the info.. Shaun | |
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Apr 29th, 2007, 03:43 AM
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#5 | | Newbie
Join Date: Apr 2007
Posts: 3
| Quote:
Originally Posted by chucktx this is what i have done to mine.......06 eg....k&n airfilter for stock cleaner....6 extra 5/8 holes in back and bottom of aircleaner for more air...jetted the carb...mufflers....remove and drill out inlet end 15/16.......reinstall and start drilling out exhaust end a little at a time....keep checking plugs and milage....i ended up with 5/8 hole in exhaust end....ya got to keep some backpressure for preformance.......your milage may vary....that being said, when i do go with slipons it will be trapps....but this will have to do for now.... | thanks for all the info ... Shaun | |
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