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Time to give something back here... In a previous post, I presented some cross-seactional areas found within the flow-path of the stock harley muffler, and it was obvious that in stock form this muffler had to be restrictive. To re-cap; even with the grunk-mod, ie boring out existing...

The weather is nice today,so i got the electric drill out, put the 44mm hole-saw on and cut the muffler inserts out. Piece of cake, only took a few minutes. Now, with the inserts out, I looked at the number of holes and some other dimensions in order to figure out what the stock flow capacity...

well, Seems I need to do something about my exhaust. First step will be to to the "gronk-mod". Looking at pictures of the unmodified muggler innsrerts, I am not all too surprised if they are restrictive considering the number of holes and their diameter. Just bought a hole-saw, so once...

Jayel, Thanks for your answer! :) Yes, I've heard about that mod, and it has crossed my mind. However, the clips you kindly posted links to, comfirms that this mod would be a bit on the loud side, at least for my taste. But that aside, how do you find that your set-up performs...

Hmmm... seems the harley mufflers are restrictive compared to stock XS mufflers then... In the meantime, I have been browsing around a bit, and I came across an interresting mod for sportster dynaglide type mufflers reffered to as the "gronk-mod" ...

Littlebill, Those bologna cut sportster mufflers, are they stock harley mufflers or aftermarket? Anyway, very interresting what you write, could sound simmilar to my experience.. After removing the sporty mufflers, did you replace them with something else, and what was the result?

Oak, Yes, of course, ignition timing and valve adjustment is spot on, so is synchronisation of the carbs, but good of you to mention it anyway, it would be a typical error neglecting this! :) And as for baseline, good point.. and this takes me to the source of my doubts.. The carbs on my...

Hi! I run Mikes XS chrome headers with Harley dyna-glide mufflers. Got those mufflers for next to nothing and theywere hardly even used! Finish and wuality was of course excellent. They sound nice, and the exhaust system really complement the looks and the lines of my '76 model. I am...

Hi! Does anybody have experience running stock Harley mufflers such as those from the FXD or Sportster range? I have a set of Dyna-glide mufflers on Mikes XS headers. It looks great and fits the bike well and the sound is very nice. My big question is the flow capacity of these...