Join Date: Nov 2007
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The lead will destroy the cat, if you still have that in your exhaust. It can also hurt some O2 sensors.
If you don't make any other changes to your bike, like raising the compression and/ or adjusting ignition timing, you will not see any benefits from race gas. With some types of race gas, power may go down because specific energy is less. The higher octane rating only signifies resistance to detonation. There are some types of race gas with higher energy density (oxygenated etc).