I run 87 octane now without problems. So you think I would need to start running 89 octane if I were to put LT headers, even with a stock tune?You will be fine as long as you run 89 octane, also get a 180 T-Stat.
Isn't a 180 T-Stat a mod for owners in warm climates? We see temps in the negatives during winter, I'm not so sure that would be a good mod for me. Why do you mention this mod anyhow? (No offense, I just don't know much about it)