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I'm running U4.4 and it's a good unleaded pump replacement without having to re map adds a couple HP but seems to accelerate better all the way through and a good price for the addition of oxygen and tetraethyl lead!!!

If you got the money run the new MR12 best fuel by far but you will have to re-map

there is no substitute for leaded fuel on the race track, I thought the "C" series was just high octane which really will be a waste and won't help make HP might as well run pump for half the price!
 
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