Friend just bought a 09 5.7 hemi Challenger. After a month of hard driving he want to go cobra hunting. I told him that is one snake his 5.7 should stay away from but he want to fight the fight. The car is a stock 5.7 with a stick. He do not want to touch the bottom end. He has already added a K&N inlet air box. What is the best bang for the buck without going the supercharger route? If supercharger is in the future, what is the best system?