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well first off, the diffrence in price is nuts. klx with the 351 bb kit, maybe 6 bills. wr, 290 kit, 1000 bucks. plus another 300 for the fuel controller. i would love to see the actually power diffrence, i bet it wouldnt be much.
Do we really need to know the power difference? A 290 vs. 351. Theres no replacement for displacement. Now maybe a 290 vs. 300 would be a different story.