The stock intake should be fine unless he is planing on doing more down the road. If he wants to upgrade anyways, I'd go with AFE stage 2.
Exhaust, I would go with MBRP. He's wanting 4" single outlet is presume? Or dual outlet? Also Aluminumized or Stainless?
As far as chip, it will depend on what is he wanting to do with the truck? Most people will suggest SCT which is an awesome product, but if he wants to save a little money for something a little less aggressive there is a lot of other good products.
I'll PM you a price for MBRP aluminum 4" and an AFE stage 2.
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