5.9 magnum with M122 blower/intercooler

That's the biggest one Eaton made, right? I have an M90 on the 3800 V6 in my Park Avenue Ultra. I gutted the baffles out the of the stock air box just so I could hear the whine when I get on it lol. I was thinking of dropping down a pulley size but with how gas is now I don't find myself getting into the boost very much.