i don't run the lrd myself so i can't testify to it's performance, but i can say that according to the dynocharts, the fmf is by FAR the weakest and shortest ranged pipe on the market. anything is a HUGE improvement over the fmf system.
also, i always thought that the right side pipe was more powerful too, but i learned recently that the bend isn't really that important. the important parameters in pipe tuning are the cone shapes and length and sh*t like that. 2stroke pipes are different than 4stroke, they do a lot more than just let out the exhaust fumes. they need to be able to suck hard to pull the charge over the piston then blow it back.
by the by, 89custom, i don't know if you've heard an f7 in person, but mine sounds just like your dyno port! no all ping ding like most 2stroke pipes. i love it. but that's a function of the silencer and not the pipe itself.
and for anyone interested, my f7 will be for sale soon.....