Originally Posted by
Y33TREKker
Be advised that Turbo Blue types of high octane fuel may end up costing you more than just the additional price-per-gallon at the pump. Those fuels are designed to be run in (for the most part) open exhaust systems.
When the chemicals that are added to provide the higher octane ratings start to come into contact with the chemical compositions in stock catalytic converters, bad things start to happen (namely, turning you cat into a rattle can type party favor full of all the chunks of material that "used" to make up the original single piece of catalyst).
So unless you had been wanting to spend some $$$ to replace the stock cats with some high-performance replacements anyway, you might want to think twice before running that 100+ octane stuff.