Check around 4:50 in the video. Also notice how he actually enjoys the handling right after that part of the video.
Sounds like in stock form the iM is already plenty firm...Thanks for the replies .Not sure I want a stiffer ride.
2016 Scion iM Review ? Toyota's Tweener Takes a Turn - The Truth About CarsThe iM’s suspension is firmer than I expected, and way more so than I’d ever expect from a Toyota. It’s not too firm for every day driving, but it is dangerously close.