I just started running the +8 and run 17.5 Blinky. Have to say it makes a big difference for me. If you run on a bumpy track I find it handles the rough sections better than the stock chassis. I find I can also push it more than I could before. With a longer chassis you may loose a little bit of the turning radius as a shorter chassis will turn tighter, but have not noticed this at all, and we run on a tight 40x60 indoor track. Hope this helps. Oh and I got TQ and took 1st last night, great night out with the new chassis, even ran faster times then Mod.