my F7 is also a top end pipe and absolutely screams up top, but this is an older lrd adjustable, and have been told that compressed is for top end and extended is for more bottom, the thing that interests me is that the fat part of the expansion chamber extends almost the whole way back to the silencer connection, so it has to act differently, but between tons of work and tons of rain, i have not gotten to the comparison yet, maybe sunday ????? i dont wanna just swap it out, i wanna ride my F7, then quickly throw the LRD on to get a good head to head, back to back ride comparison, both will be using my existing LRD silencer