Challenger SRT Hellcat
I sent in my 2.85 upper pulley for the Griptec work. The car still has stock upper pulley,
but I am always wiping off the belt dust. I had great luck with their upper pullies before and even gained 1.5 psi on previous Hellcat going from Metco 2.75 to the same size Griptec 2.75 but I wanted a clutched upper pulley for the Redeye.