I dont have a lot of experience with other brands but I put a Whipple on mine and love it. Looks great in the uncoated silver see my page for a pic. Lots more torque around town as if theres a bigger engine under the hood. Cool sound too. Runs cool. I got the 8psi stage 2 kit but kept my ati underdrive pulley so the boost hits 6.5 to 7psi max and I was able to sell the msd fuel booster that comes with the kit cause it wasnt needed at that psi. you dont want to go over 8psi without piston changes on any supercharger so i kept it slightly conservative.I am thinking of putting a supercharger on my 2006 300srt8. Looking for input from those who have put one on there's or thought's on what my be a better HP upgrade???