2020 BMW R9T Pure, Ali tank.
Hi 5MOSO,Anyway, for those more interested in the exhaust. I've probably done a good 100 miles on it now and am really really happy with it. The sound is exactly what I was hoping for. There's a lot more bass to it and it sounds gurgly and purposeful at idle. Above 5k it's a real nascar wail and overall the sound is just transformed from stock.
Firstly, no the exhaust doesn't burn your right foot. But yes, it does seem very loud because there's now a much more direct path from the exhuast tip to your helmet something that becomes obvious when you open your visor and the sound really levels up more than it would normally.
I did a few test rides and decided that the db killer was to become a permanent fitment. It doesn't really dampen the sound at idle but takes the edge off at speed so that ear plugs aren't necessary. Thankfully the db killer supplied by mass fits snuggly and seems well made.
It also became obvious that the bike was running lean. It smelt lean, the torque flat spots very accentuated and the engine ran a good 8 degrees colder on average. The bike ran perfectly fine, no stuttering or rough idle but it was clear that things could be much improved. I went out and purchased a Rapid Bike Easy unit. Essentially a piggy back device that offsets the lambda values the ECU sees. There's a lot of discussion on here about such devices and how to install them so I won't cover that here. All I will say is that it's cheap, easy to install and definitely makes a difference. The bike now runs very well, the torque flat spots are pretty much gone, the bike runs at the temperatures I would expect and I rarely hear an overun pop or bang. However, I must add that the bike could clearly do with richening up at full load above 5k rpm. I believe the bike runs open loop lambda at this condition which may explain why the Rapid Bike unit doesn't help but I could be wrong. Either way, if you're chasing peak hp, get a full tune or better still an exhaust that has been tuned for more race-oriented performance. This exhaust is about lovely chugging torque which suits me down to the ground.
As mentioned I will try and get a good recording put up on here for you guys to listen to but the first one I took wasn't great at all so I need to have another go.
Overall I am loving the sound of this bike more an more with every ride. When you give it the beans it's like you're in the bullitt mustang car chase or something! It's too loud for me without the db killer but spot on with. If you want to ride big miles with it and are worried about the volume then maybe option it with a cat from MASS. I'm sure that would tone it right down. But for me the sound is perfect and really compliments the character and image of the bike. Everyone who's seen it has been super complimentary and instantly wants to have a chat and learn more. An expensive exhaust for sure but then a full system always is. If you guys have any questions about it then shoot and I'll do my best to answer.
You say the bike ran a good 8 degrees COLDER because it was too lean.
If it really was running lean it would run hotter, not cooler.