Every car is a little different. I know of some cars that have maxed fuel or maf counts with upper only.
At a minimum you need the pulley, aftermarket aux idler, new belt and a custom tune.
I always recommend having the car put on a dyno and tuned rather than some canned mail order tune.
My motor is worth a little more than saving a few bucks.
I'd also suggest an irs brace as another future mod.
"I'm not driving too fast...just flying too low"
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
90 7up vert - new project-07 DSG Focus -DD