the barker would be better on the r than the rossier imo. you can youtube the dyno comparison with the dasa and barker for an r model quad. not sure why but the barker does really well on efi bikes, the dasa and monster really shine on carb bikes. i would say the rossier on the r is a step below the barker, yoshi, dasa, monster....those top 4 are so close probably it's splitting hairs. yoshi will be quieter than the other 3.