2005 6.0 looking to upgrade, what's a good unit to purchase, I put a programmer on it last year and really helped

thanks

AFE and K&N are making good products. Filters are synthetic- just wash and let dry, no more oiling. I put on the K&N Blackhawk series on my 06 Dodge last year.

S&B makes a decent one for that

DO NOT put a K&N on ANY Powerstroke. This is a general no-no across ALL of the diesel forums.

I have a foam filter on my PSD from years ago, and it has held up well. The manufacturer is out of business now though.

AFE makes good products.

I wouldn't change it. I had an 06 and everything I read said the factory stock filter is the best available. Mine came with a CAI and I hated it, it was really loud. I sold it and put a stock unit back on and there was no noticable difference other than much quieter. I think the stock is good to 500hp.

I can't speak specifically for your model but I have had great luck with AEM HD intakes in the past.

S&B intake with a dry filter and be done. Don't want the oil from those wet filters sticking to your turbo blades.

I put a K&N cai on my silverado and am glad that i kept the factory unit because I hate the nose.

I doubt that will make any bit of a difference. Crankcase vents into the intake pre turbo and let's plenty of oil get all over it. Ever seen the problems they have with intercooler boots? The problem with oil on the filter way back was it getting on the mass air flow sensor.
Leave the stock setup in there. It is more than you need for what you have

Not sure on the diesels, but doing some data logging with my gasser truck, my IAT temps, are not much higher than ambient once on the freeway. The stock setup draws from the inner fender well. It does heat up at idle, but I think thats from the heat soak thru the plastics and what not. Once you get moving, it cools back down.