RD400C JL exhaust classic retro

[Rhino363]

Is anyone familiar with this exhaust? Is there a performance gain over the stock exhaust? How does it compare to the race exhaust from JL? Not much info on the site other than it fits with stock pegs and stands.
Thanks

[Striker1423]

Well without a dyno to use, the performance gain would seem pretty small on the set I have (sub 5hp). Mine's on a RD250/350 hybrid though. They sound good though.