I am using the KS tuned pipe on my DA 50.Using the zero drop header from DA.Swinging a 22X8 NX prop at 7400 rpm.I fly at 5000 ft elevation and wanted the extra omph.This set up was easy to tune and gives great transistion.Yanks my Extreme Flight Yak at 16 lbs really well and has nice pull out from a hover.Because of the rpm's it does bark a little prop noise but the pipe is pretty mellow.Anything is better then that Slimline as they are power robbers.This was my first tuned pipe and I am very happy.