I've never really heard that, but if you were using aftermarket cable bushings it would stiffen things up a bit. If you're a real baller you can get the bushings and Hybrid Racings new race shifter cables, but they're over $300.
The whole process is fairly straight forward with only one caveat.
1) Get the Right Hand Side seat release mechanism (82221-SNA-023) - no need to get the left because the exising LX works just fine.
2) You will need some hardware to secure the new latch, a bolt and nut something...