I have a 2010 F150 FX4 with a 6" lift and am looking at adding a couple of things. First,I'm thinking of a new muffler with dual tips out the back end and debating between Flowmaster and MagnaFlow. Another thing would be to add or not add a K&N Intake. Last but not least, would be to add or not add the Superchip. Any suggestions? I could definitely do all of them but have read that the K&N really isn't significant. As far as muffler goes, I want a deeper sound but I don't want to hear my truck coming from a mile away either. Nor do I want to hear a loud drone on the highway.