Best to sell the na model and get an SRT6. The delta in cost between the two is less than the cost of the SC Kit from Kleemann. I really debated this before I bought my Limited Coupe but I had to draw the line on cost at some point. I know the SRT can be had for another $5K but I just couldn't justify it.

FYI, http://www.speedinnovation.com sells a chip that will get you an additional 20 hp and 20 tq at the wheel for $600. Its not close to SC power but its more hp per dollar.