I just looked at an R very carefully and saw that they have extra bump stoppers that hold the rear hatch in place better. Look at part 11 and 13. We don't have these on the GSR/LS/etc. They looked like they hold it tight in place. Good mod IMO, esp for those with heavy ICE

 

I guess so but who wants to run heavy ICE in their car and race. That ICE, if its a good system, should still rattle the hell out of a car.