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In my experience only a well-designed header will actually do much for modern engines, and even that will make very little difference. On older equipment--predating FI and ECUs--some of that stuff might make be beneficial to FE when coupled with good driving technique; however, I can only speculate on that.
A scangauge is the best bolt-, um, velcro-on accessory for the money, and probably the only one that will surely pay for itself over time.
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