It makes a difference from what ive read but there are a lot of other stuff you cant do that makes just as much of an impact in terms acceleration with a 17.5. Avid triad slipper clutch is like half the weight of the stock VTS slipper so that is a HUGE improvement of drive train weight and quicker acceleration. another easy upgrade is a aluminum top shaft, either avid or mip. I run the avid centering kit so i have the longer avid top shaft. while youre replacing the top shaft, pull all the bearings out in the transmission and either replace them all (if you do that, pull off all the seals and clean out the stock grease and put a SMALL amount of bearing oil in them) or clean your existing bearings and leave the seals off. the seals cause resistance and since they are fully enclosed in the trans, you dont have dirt to worry about. the last thing i do is i run a shaved diff gear

this reduces the drive train weight even more and since ive done all these upgrades, my motor temps have significantly dropped and the acceleration has shot through the roof. the 17.5 pucks system im sure will make a big difference but with all this stuff, you dont need it.