has anyone tried drilling the stock pipes? cat? - Harley Davidson Street Forum - Street 500 and 750
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post #1 of 2 Old 05-24-2017, 10:28 PM Thread Starter
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has anyone tried drilling the stock pipes? cat?

what does it look like in there, once you take the end cap off?






the newer style Touring mufflers can be drilled pretty easily, and it does make it sound a bit better than stock.








https://www.hdforums.com/forum/exhau...e-drilled.html




has anyone removed the muffler and drilled out the cat? any reason to? less heat? more HP/TQ? more MPG?
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post #2 of 2 Old 05-25-2017, 10:15 PM Thread Starter
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the center section is a "wave" tube, so you can't drill that out.


the outer ring was easy enough to drill, we used a punch to make a pattern (uneven, of course) and made several holes around the perimeter.


there is cloth packing in there, and that will effectively block the holes until it blows out/wears out (you always hear of pipes "breaking in" and that is what happened, the fiberglass packing has all blown out of the pipe)


anyways, it does not sound quite as anemic now. it actually sounds mechanical instead of an air leak.
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