Depending on what tyranny you have and what rear gear ratio, going to a higher gear might be the better cheaper option for running 33's. Less strain on the tranny and better mpg in city especially with the 6 speed. I would suggest that if you do any tuning to the transmission for firmer shifting/torque converter lockup to upgrade the cooler. That is if you even have one. Only seen your profile pic looks like you have a extended cab. So I don't know what your packing. A good tuner will charge you about 500-600usd for a custom dyno/street tune and part of that is for the credits to unlock your truck. So any changes down the road like regearing or tiresizes will be cheaper and no wait and hands on. I rather not wait on emails and files to adjust over and over. Alot of poeple swear by diablew and blackbear. Im just the sort of guy to look a man/woman in the eye before they tamper with my expensive piece of lovelyhood. An intake alone won't net you much and thats in the higher rpm band. Most don't even do sh*t but make noise till you tune it. Upgrading your exhaust with an intake helps with air flow. But for maximum benefit would be a custom tune, most will be in the transmission. Also tell them not to fk with the torque management or you'll be having it rebuilt sooner then later. If your lifting your truck more the a simple 1-3", say goodbye to your highway mileage unless your going to be grandmaing in the right lane. I got a lowered 2010 crew cab with intake/exhaust/headers/underdrive crank running 93 custom tune with 5.3l 6 speed with the shtty 308 gears. I told him to be on the conservative side not to overdo the timing in case I get bad gas. I'm only getting 297hp to the wheels. Afm turned off, stock cam, 188k on the clock and getting 16.3 mpg average doing city and highway. A good idea is to get the old intake back on till you decide what you want. Max I seen an intake give on dyno for the nnbs is about 15hp on a 93 tune for a 5.3l the timing was ridiculous and thats at 5500 rpms. Get a gm oem/Delphi sensor if yours is bad. They are a dime a dozen.