I had a local customer come by last week for a Vararam install. His truck is a bone stock 2014 1500 RC/SB Express w/ 3.55's and 6sp transmission. 2 weeks ago, he ran a 14.7 @ 94mph (It was 70* at the time of that run. I installed the intake for him, and he called me the next day saying he didn't feel anything and wanted to return it. I asked him to take it to the track and call me back with his results first. He went on Friday night and ran a 14.3 @ 97mph (68* outside). Only changes from 1 pass to the next was a 2* difference in air temp and the Vararam intake.
Its sometimes hard to feel gains in the seat of the pants with a 5500+ lb truck, but the right parts will show gains. He's keeping the intake now and coming by this week for a Hemifever tune and throttle body, so I'm expecting him to easily be into the 13's with just a few simple mods.