[376LS3]

I use the Torco Accelerator. Its about $20 a can. If you buy 6 on ebay, typically its like $114. That is the only stuff that will actually add octane. Its basically concentrated race fuel in a can. They give you a table with how much to add to 91 fuel to get any desired octane up to 104. Thats the best stuff I have found. I have scanned cars with and without it, and it is definitely doing its job. Now I just use my 93 tune as my "race tune" when I add the Torco!