AAACV8 ~ 'But wait, there's more' Porsche-owned tuning house Manthey-Racing has unveiled what could be the hottest warranty-backed 911 GT3 RS yet, complete with enough downforce to exceed some dual-cab utes’ payload capacity. If you haven’t heard of Manthey-Racing, it is to Porsche what AMG is to Mercedes or M is to BMW, even if its performance upgrades are technically made after the car is already built rather than as it rolls down the production line. The simply named Manthey Kit is now available for the 992-generation Porsche 911 GT3 RS, adding a host of even more aggressive track-focused upgrades to the rear-engined supercar.