Re: SRT S/C pulley?
You can't change the super charger pulley as it has a electrical clutch on it like an automotive air conditioning compressor does.
Only way that I'm aware of to change the pressure boost is to change the crank pulley for a larger one (overdrive) and then smaller one for the other accessories (underdrive).
I was looking into the EvoSport set, but the truly affordable one has a solid lightweight crankshaft pulley without a harmonic balancer (NOT a good idea). The other set they have that includes a harmonic balancer is nearly $2,000.
Unless you have or will be tuning your ECU, you will not see much gain per $ for the boost change.
The Upsolute tech I spoke with recommended getting the pulley change in addition to the ECU upgrade as it would help fully realize the ECU change