Stock, the Grom is slow and not fun to ride. But after an exhaust, intake the DHM Stage 2 Flash and S1 Cam, 3rd and 4th are now my favorite gears! Way more punch in the mid-range and getting up to 60 is done with ease and I’m 220 lbs. Don’t waste money on a cheap exhaust; do yourself a favor and buy a reputable brand (Yoshimura RS-9T) and intake and you won’t regret it. To make the Cam install easier, pull off the flywheel, release the pressure from the cam chain tensioner and while in there, replace and upgrade it.