Yeah lower EGT's and excellent sound. I made my own EGR delete, check out the 6.0 forum, I did a write-up on it. No I dont have a check engine lite because I have a custom tune with all the EGR parameters turned off, but if you dont get a custom tune yes you wil have a CEL.
a 265-70-17 (stock size for trucks equipped with 17's) is 31.6'' tall trucks with other wheel sizes still should hae about the same height tire. 33'' will clear just fine, some guys on here run 35's on stock trucks, howeer I think it looks silly.
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