I have a 6.0, and his files are great. I can honestly say i have never heard a bad thing about Matt. I wanted to go with truck source diesel, but their policy changed right as i was going to order. Im glad that happended though, because Matt was a dream to work with. Everytime i emailed him with a question, he wrote back within hours, which i consider pretty good. I emailed him my strategy at 8 PM PST, and i had files waiting for me by 9 PM PST, SAME NIGHT. I have emailed him with a couple of questions after purchasing tunes, not specifically relating to his files, and his response was immediate.
I LOVE that his files are nearly smoke free, and he will turn down your business if you request a smoke file. As far as performance, i run his SRL as my DD, married with PHP's atlas80 FICM tune. The throttle response is amazing. When stock, the truck feels heavy and hard to get rolling. With Matts tunes, the truck feels nimble and makes in town driving a cinch. Shifting is tight and firm, and TC lockup is perfect. My truck flat out gets it. Getting on the freeway is a 100 MPH adventure everytime without trying. I havent tried anybody else, but like stated above, i have no desire to try other tunes.
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