Don't get me wrong, you can still put on the supercharger after the headswap and run low boost, like 5-6#. You'll still make in the area of 330-350 rwhp with the stock bottom end. Just make sure you don't go lean as the stock pistons don't like it.Then when you get the money/time you can get forged piston/rods and up the boost.(11 -12 # is about all the Saleens are good for in stock trim I think)