I've been working to improve the exhaust sound and performance on my 2021 Pure. I first replaced the stock headers with a stainless steel Akrapovic header, which eliminated the catalytic converter and flapper, and I kept the OEM Akra dual muffler. I was hoping this would eliminate what we've been calling the "Cold Start-Up Issue" when the bike revs at high rpms for about 20 seconds as it warms up and then returns to normal rpms. The Akra header gave a significant weight loss, a terrific sound, and a freer exhaust flow, but it exacerbated the cold start-up issue by causing the bike to sputter and die on start-up. I reluctantly put the OEM header back on and tried to accept the sewing machine sound. In the meantime, I ordered the Unit Garage Double Low Pipe Titanium mufflers and a pair of their DB Killer Pros. Received the package today and just finished an easy install, then went for a short test ride. My first impressions: the titanium mufflers are light as feathers and they are beautiful with their exposed welds, in my opinion. I set the DB Killers at 90% open to begin dialing in the sound, and I think it sounds about right - not too loud by any measure, but definitely gives a deeper, more resonant rumble. I was a bit concerned that they mufflers would run hotter and possibly mess with my Unit Garage panniers, but I didn't notice any excessive heat on my short test ride. I'll keep an eye on it, though. And it was a tight fit to avoid interference with my SW-Motech center stand. By re-installing the OEM header with the cat and flapper, it eliminated the sputtering and stalling on start-up, and the mufflers give me a much better sound. Here's are a couple of photos:
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My initial impressions of Unit Garage Double Low Pipe Titanium mufflers
I've been working to improve the exhaust sound and performance on my 2021 Pure. I first replaced the stock headers with a stainless steel Akrapovic header, which eliminated the catalytic converter and flapper, and I kept the OEM Akra dual muffler. I was hoping this would eliminate what we've been calling the "Cold Start-Up Issue" when the bike revs at high rpms for about 20 seconds as it warms up and then returns to normal rpms. The Akra header gave a significant weight loss, a terrific sound, and a freer exhaust flow, but it exacerbated the cold start-up issue by causing the bike to sputter and die on start-up. I reluctantly put the OEM header back on and tried to accept the sewing machine sound. In the meantime, I ordered the Unit Garage Double Low Pipe Titanium mufflers and a pair of their DB Killer Pros. Received the package today and just finished an easy install, then went for a short test ride. My first impressions: the titanium mufflers are light as feathers and they are beautiful with their exposed welds, in my opinion. I set the DB Killers at 90% open to begin dialing in the sound, and I think it sounds about right - not too loud by any measure, but definitely gives a deeper, more resonant rumble. I was a bit concerned that they mufflers would run hotter and possibly mess with my Unit Garage panniers, but I didn't notice any excessive heat on my short test ride. I'll keep an eye on it, though. And it was a tight fit to avoid interference with my SW-Motech center stand. By re-installing the OEM header with the cat and flapper, it eliminated the sputtering and stalling on start-up, and the mufflers give me a much better sound. Here's are a couple of photos:
![Image]()
![Image]()
Yes, I've heard all the Euro 5 R9Ts do that, too, but I was hoping that there would be some way to eliminate the cat and flapper and tune the cold start issue away. I haven't had any luck, but I'd like to hear from anyone that has.
Thanks for the feedback, Kickstand_Down. I just went for my morning sunrise ride, and the bike started up fine without sputtering and ran through its 20 second warm up phase without needing to hit the start button again. The sound is good - a little louder than the stock Akra dual muffler, but not loud enough to wake the neighbors like before. 
I always park my bike on the center stand, so I've never experienced the "oil build-up issue" with the R9T, but that was certainly an issue back in the old days with BMWs like my old 1973 /5 and 1978 R100rs if they were left on their side stands overnight.
I always park my bike on the center stand, so I've never experienced the "oil build-up issue" with the R9T, but that was certainly an issue back in the old days with BMWs like my old 1973 /5 and 1978 R100rs if they were left on their side stands overnight.Thanks, JustABill. That's the sound I'm getting from my UG mufflers + stock header. But, I think your video clip amplifies the sound a little bit. After a month or so of getting used to the sound of the UG mufflers, I'll say they are louder, but not close to being obnoxious - there's more of a "bark" when accelerating, but no "droning" at speed or "babbling / popping" when decelerating. The initial 20 second warm-up, high revs issue is still present, but I've learned to deal with it.
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