if you're going rpg stage 4+, before you buy the rpg tuned shocks i'd tell them you're going to run a whipple, it's an extra 100+ lbs to the front and might affect the rpg tune on the shock, also you might want to consider the prerunner instead of raceline if it's a street queen, the raceline's will be noisier and need replacing, the urethane prerunner is more than you'll need. also as far as the whipple do your homework the 6.2 don't like a lot of boost and after install of just the whipple with upgraded heat exchanger you're looking at 11k, plus you're looking at long tubes, so just in parts and install i'd say 14k for long tubes and whipple. you may want to just built the block while you're at it. my build is about done, the only thing left is to decide whether i want to sc or go longtubes, can't imagine doing this kinda of build on my daily, with the downtime, thumbs up to you, i haven't even driven mine in two weeks!