I have the Twisted Customs gated oil pan. It is cool. Kinda rough looking IMO for the $$, but very functional. YOu won't need an accumulator if you use one, so it is a wash if you were going to buy an Fbody oil pan and then an accumulator.
Intake is all stock 2007 silverado
Conputer and Harness were done through Twisted Customs by Swanke Motorsports out of Minnesotta. They do the same thing as the rest of the guys out there like Jim's Performance etc....
I have Hooker Ceramic Coted headers with a custom Y pipe to a POS 24" glasspack. I just got a Flowmaster Hushmaster ceramic muffler to replace it after this trip.
The mods I have new a 15% gain in horsepower from the stock 330hp......about 50 more HP or 380 hp. More than plenty with my 5.40 gears and 40's. It feels like 800hp with all that gearing.
I highly recommend keeping out of the GenIV motors. They work GREAT like they are and when you start dicking with the cams, heads and stuff you just decrease reliability and driveability on the rocks. The 6.0 truck motor comes on super, super smooth and is a nice solid powerband. No surprises.
I mated it with a 2200 stall in the TH350 and it is awesome.