2010 Ultra with cat removed. ViEDS installed and bike is much cooler than before ViEDS. No real data but the seat of the pants. I started at 65% all was good and adjusted to just below 45% and bike got hotter. I quickly switched back to 65%ish. and all good. Rode today in 100 degree heat and bike heat was hot but not unbearable as it was bad in 70 degrees a few weeks ago. Just my opinion... I could be wrong.

 

I just installed mine today....it was immediately obvious to me they were installed.
My bike: 2016 RK. SE Stage 1 AC, Street Cannons, and dealer DL
Bike idles smoother, and the off idle stumble is gone. Popping is there every now and then, but I personally enjoy that. Can say I do get some sulfur smell out of the day after a hard ride, so know I'm feeding in more fuel.