the 6.1L cam is like 200 bucks all said and done. but you gotta be willing to tear your engine apart or other members will do it for ya for a small fee. grab a cheapo intake off ebay. just make sure it goes from behind the headlight to the throttle body. intakes and dyno numbers are crap. a dyno is not accurate from one to the next. they are for cutsom tunning so your not getting pulled over while hitting the redline etc..

the arc-1 gets wired into your truck and allows the adjustment of the af ratio at certain rpms. you can lean it out or richen it up. very simple and strait forward how to tune them. the pcm is the power control module