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I know I'm putting the cart before the horse by changing exhaust before I have the bike sorted out. I had all along knew that I didn't want the stock exhaust on this bike and now I am wondering what will work well with the stock carbs and air boxes which I want to keep. There are a couple that I'm leaning towards and I will post them here.

https://www.ebay.com/itm/2FastMoto-...e=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649

https://www.ebay.com/itm/EMGO-Slash...e=STRK:MEBIDX:IT&_trksid=p2060353.m1438.l2649

They both have removable re-packable baffles but I am wondering how they will perform with the stock carbs and air boxes. I like the look of the slash cuts better than the reverse cones. Does anyone here use either of these or have they had any good or bad experience tuning a cb450 k5 era bike with either? I have also thought about using a straight pipe extension that I can put baffles into. Any and all advice welcome.
 

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The slash cuts are basically hollow tubes, with minimal silencing and back pressure, and the others are nearly so, but have a screen as a baffle. I had something similar on mine. I replaced them with these: https://www.dimecitycycles.com/26-inch-reverse-cone-megaphone-muffler.html
and the bike starts and idles better. They are louder than stock, but not obnoxious, like the hollow tubes. You need some low rpm back pressure, it seems, to run well.

You can see the RH one here:
 

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One general rule with mufflers, more interior volume makes for a quieter muffler. Slim mufflers simply cannot be made quiet. If you're going for a certain look they have advantages, but if you're a rider they may not work out. There are lots of stories where the inexpensive smaller mufflers were replaced with larger, more expensive, higher quality mufflers.
 
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