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fast2007
01-05-2008, 09:07 PM
I see 400ex with 450 carbs, anyone No how much gain?With stock or motor work..

Sandman69
01-06-2008, 09:20 PM
Go on the 400ex forum and there is a big sticky about this whole topic. I changed mine and noticed a huge difference. How ever I already had a 440 kit and cam in the engine once I did the swap.