I just purchased a 2006 300c AWD with the 5.7, but its a one owner car and only has 29,000 miles. My plan is the standard; cold air intake, long tube headers, an exhaust, a camshaft, and tune. But what camshaft should I use, I just want what could be considered "the next step up" from stock. If I do a cam I also plan to do the comp 918 beehive springs. Thank you!