It is personal preference...but if I were in your shoes, I would go with the tuner first. Especially rolling 35's! It makes a huge difference getting your shift points where they should be, let alone getting your speedo right again. I am waiting for my custom tunes right now, but I am running the canned 87 tow tune. It is amazing what even the canned tunes do. In all honesty, I don't feel much (if any) power loss from switching from my stock tires to the 34's I am running with the tuner. Good luck...and have fun!
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