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the only way this tip helps is by increasing backpressure at lower rpms, which might actually improv gas milage is you cruise at 1500 rpms or so and the exhuast could scavang better but it would reduce power at WOT. it depends on the tst on how they got that much better Mpg, it may or may not be BS but i am not going to spend 80 bucks on an exhuast tip