i did my plenum/kegger mod a few weeks back.... and its pretty easy it took me a total o about 9 hours.. took me a good 3-4 to pull it and 2 hours to mod it and u let it dry over night and then 3 to put the pan on and reassemble it all...

mine had a super bad leak and my truck runs so much nicer.. i also a few days later checked the plugs cap and rotor and 02 sensor.. which maid a little differnce too idles alot better