Just grab a 6.4 SRT engine and bolt it in, sell your 5.7 engine to recover some of the cost. They are underated at 485 HP already and your truck intake bolts on and is better than the 6.4 SRT intake. It will look totally stock under the hood if you paint the block black, the only way an emmisions inspector will know is if he is well versed in Hemi speak. The later 6.4 SRT uses the BGE block and is just a tad different on the outside of the block, the earlier ones are very hard to tell the difference. You can find them fairly easy around $5000 and sell yours for $1500-$2000 and well you see where I am going with this... I doubt your going to get much of a supercharger for $3500