We run these on the Element Tuning Time Attack FRS and honestly there are no downsides, so easy to install, and fits perfectly. This helps to reduce the deflection of steering rack due to the rubber bushing with a bolt through it.
So the more mods you have to your suspension and tires the higher the degree of deflection you will get and it's very substantial with race tires, race suspension, and a big front sway bar. Think of this product as a strut bar for your steering rack in that it won't eliminate 100% of the deflection but will reduce flex in the bushing substantially. The good thing is that it doesn't eliminate all of the benefits of having a rubber mounted rack vs. a solidly mounted rack (harmonics, stress, zero give on impact).
I think I need a Perrin Steering Rack Lockdown for our STi Time Attack car as that rack shifts so much I'll come off the track with a crooked steering wheel
Thanks,
Phil Grabow