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If you were to do a search here, you'd find this question asked and answered at least 2,387 times. The "best" sound is subjective and mkguitar has it right...go listen to different bikes. Some people swap pipes out regularly to get that perfect sound. Good luck!
Like someone said before go out and listen to a few different types. (BEST) exhaust is subjective like "what type of oil is best", "what speakers are the best", and "what tires are the best". Different strokes for different folks. Whichever way you decide to go de-catting them will give you a better sound on all slip-ons.
Whether or not your converter is in place, you'll notice a difference in sound and possibly performance (depending on the muffler) with different slip-ons. The only two things removing the converter from the stock headpipe does is cut down on the heat a bit and make more noise.
I don't think you can do much better than the 4" Dyno-Tuned Jackpot mufflers. They're high-quality, sound great, and have a lifetime warranty. They also flow like crazy.
With that said, I'm still firmly in the "buy a tuner first" camp.
I am using V&H Monster Ovals....for me..not only do I think they sound good....low rumble where I would not wake up neighbors early in the morning...can hear the radio.....and to me....they look great underneath the saddlebags and sticking out the rear....
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