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Hey guys im wanting to do some things to my 04 6.0 powerstroke that will give it some more power. Im thinking of doing headstuds, sct tuner, powermax turbo, and maybe some bigger injectors. I was thinking 190cc injectors but i dont know who makes good injectors for these. If you've done anything like this or know, please let me know what you think i should do. Also My truck is an auto and is lifted on 38's. Thanks guys
If your truck is running OK and has no engine issues, I'd lean toward a gear change first.
Adding HP may not get you the performance that you are looking for. Those 38" tires really require lower gears. Run a gear calculation to find the best gear ratio. As a starting point, assume that 3.73 gears are the minimum for 33" tires. This means that 4.33's or lower would be your new minimum. Others on this site have 'hands-on' experience with gear changes and results.