I installed the Mountune in early 2014, only kit available at the time. The problem with 6th gear was you could get it, but barely, just did not quite engage fully, felt like it could pop out (and did a couple times). Randy at Mountune sent me the revised piece with no problems, so I ordered a bushing kit and installed all the new pieces at once.
Turned a very good OEM shift into excellent.
I eventually got OMP pedal kit, messed with pedal height and spacing until it is perfect for me. Clutch engages barely off the floor, brake/throttle set up for easy downshift blip, now a good OEM setup is great.