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I have an 07 F150 Lariat with 5.4 V8. I've seen there modules advertised that say they will increase HP and gas mileage. Is this true or BS. and if true, which one is best and will it void my warranty? Thanks, Matt. Probably everyone knows this but me.
There are several on the market that can "tune" your truck for economy and "go fast", lol. Try posting your questions in one of the site's tech forums. Our members will be glad to offer you the opinions that you are seeking.