Yes it is much stiffer than the originals, however I like it because when you go over bumps you don't lose much traction and can accelerate out of turns and roundabouts very well. The drop is nice but seems like when I reverse up my drive way, my front end hits the pavement. Not too sure what is hitting. Will need to try it out again to see. Worse comes to worse I'll have to reverse up with one tyre at a time.
Regarding accelerating out of turns and traction, might be due to the sway bars, not too sure, installed them at the same time.