I can't speak for the Graves system, but I just installed the DASA full system and fuel controller last night. Didn't get to spend a lot of time playing with it by the time I got done done but it feels much more responsive in the lower RPMs and sounds awesome. I would have a comparison video on youtube but I forgot to put a SD card in the GoPro lol. If it stops raining and I can get out of work at a decent time I'll try again, for now look up yxz goldrush supermoto practice on youtube...its not me but he has the DASA and it sounds awesome in my opinion....Ive heard one other system in person, can't remember the brand but it was a dual tip, which i don't care for and it was kind of obnoxious. just my opinion. I did consider the Graves but had heard the DASA in person and heard some good reviews....I think they claim 12hp gain and 8lbs weight savings.