I just bought a 2000 ford f350 dually with the 7.3 liter turbo diesel engine and manual trans. This might be overkill for its intended use, which is to tow a 18 foot enclosed trailer with two walk behinds and a ztr but I thought it was better to get too big than too small. Anyway, I was wondering if anyone had an opinion on these superchips that I keep seeing. Does it improve fuel economy? What are the benefits and drawbacks? Is there a specific brand that is best or to avoid? Any help will be greatly appreciated. Thanks.