ORIGINAL: Jake Ruddy
If you use a quality canister like MTW or KS it will be about the same with the proper length. Tony and the like overseas are coming out with some but they are too short and not designed properly. I lost rpm with those ones.
I lost the same with my Brillelli 366, DA header, and Ks1090 canister. I know if I tune them I could probably could get it so I'm not losing the 200 rpm, but by the time I got it in the plane I'm not going to take it all out to cut the header then reinstall it, maybe having to repeat that 3 or 4 times. I'm willing to lose 200 rpm and have it quite, both my Brillelli and MT have great throttle response and take the planes OOS vertically.