I've seen that floating around. I've tried to find what size pulley the stage 1 kit comes with but I can't seem to find it anywhere.
Did you read 1st post?
Who cars what it come with this is what you need.
On my 2018 M6 GT with MBRP 1 7/8ā LTās, high flow catalytic converters, H-pipe and MBRP dual chamber mufflers, 3.625ā pulley with 20% OD, 10 rib kit, Fore fuel system, E85, ID1050X injectors, stock DIās, JLT oil separator, K2 alternator brace, shaftmasters aluminum DS, boundary OPGās, Palm Beach Dyno remote tuned, BDX tuner, built by Signature Speed (Anthony Ballard