do whatever one is cheaper. i believe u wont have to upgrade the internals unless you want crazy hp. theres a guy/website that has your generation max boosted and was putting out really impressive numbers on stock internals. do some searching man.datboimell said:so evan if i have 160k on the dash in my max i should still rebuild or just swap the same engine.....id rather rebuild but what company should i go to.......cause hardly no one make internals for the max.....i kno jimwolff makes cams but thats about it.........