Can't help on the octane booster other than to be really careful what you put in there. If memory serves you've only got 91 fuel where you're at. If so, your down around 30HP. I had to run 91 in my car for about 200 miles. I only had to lean on it once to realize the power loss. If you have E85 you can run a E30 tune and get back your 30hp and maybe more.Are anyone using octane booster? Any other alternatives to get the full power out of the engine? From the reviews it sounds like it makes quite a bit of difference.