I installed the PSC rack in my Mk5 build based on multiple recommendations. It is highly recommended to add rack extenders for the best front end geometry and elimination of bump steer. Which isn't nice. Not necessary on the Factory Five supplied PS rack because they source them with the wider dimension. Nothing about the PSC rack is going to compensate for the narrower stock width. I installed Breeze #35491 Rack Extender Set, 1", for '87 - '93 Mustang Power Rack. Factory Five also sells them. They were a little challenging to install because the inner tie rods on the PSC rack were very tight and not easy to break loose. But got it done. My Mk5 build is still underway, so I can't comment yet about actual performance. But I'm confident it will be fine.