You won't see anything with just the intake elbow down, that would justify the expense.
The exhaust and custom SCT tunes will make you think you have a new truck. With the 6.0L you need to get a monitor, or a set of gauges, and keep an eye on everything. This will prevent costly repairs down the road.
If you're looking for bolt-on power, here's where I'd start:
Monitor/Guages: Edge Insight CS/CTS with expansions covers a lot of good info for the cost. You want to monitor EGT, ECT/EOT, Boost, and Fuel Pressure at a minimum.
Air Fitler: Stock air box is good for 500HP, want more air go with the S&B CAI.
Exhaust: Turbo-back 4" stainless, deletions of CAT/Muffler, per local regs.
Tuning: Custom tuned SCT, running either Eric's (IDP) or Matt's (GH) tunes.
Turbo: Powermax Stage 1, will support builds upto 500HP with injectors (this turbo will support 190's for a short period of time, but really shines with a set of 175's -play- or 155's -if you tow alot0-).
Injectors: Ryan Casserly makes the best 6.0L injectors out there. Depending on what power level you're looking at (155's ~ 480HP, 175's ~ 520, 190's ~550 HP)
Intercooler: Banks makes a good unit for the price, but its not needed unless you're having issues with EGT's. (This is also the only peice of Banks hardware I recommend on the 6.0L)
Transmission: If you're going big, drop the money and get a built 5R110 for a good shop.
Building a set up with 190's you'll want a built Transmission, the stock unit won't hold up long, and a Stage 2 VGT turbocharger.
You'll want to read up and get into the 6.0L if you're going to mod it, this is a very basic rundown of the common knowledge.
Last edited by colo_dually; 07-03-2011 at 11:44 AM.