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I use a billet steel unit for safety reasons. I've had a billet aluminum one but they are a pain in the butt in terms of oil contamination and they don't last. And don't believe the hype that an aluminum unit will make you go faster either.




Mine did not wear much but it is a giant pain using a steel billet one now if there was a performace difference it did not show up same times this spring?? No other changes!