I will have to say after putting the cherry bomb, taking the airbox lid off and removing the baffle helped the r450. Now i must say after putting the yosh slip on. dobeck tfi controller on this thing will rip. I had to dial in my controller today, which took maybe 1 to 2 hours. I am still fine tuning, the quad idles better, throttle is more crisp, and it also sounds alot better.