Hmm I see Murf has the dreaded smokem if you got em disease:D.

I have a 99 F350 Dually PSD Crewcab with a 5" exhaust and Diablo programmer. Talk about some power!!! Mileage of course has gone up provided I can keep my foot out of it. I get a pretty consistant 15+ MPG as a daily driver, I havent done any long highway driving since I added the programmer, but stock programming with the exhaust is 18+ though the mountains of west virginia and those areas. Diesels are very easy to get more power and economy out of them, but not the gassers. the most you can get out of a gasser without huge expenses and reworking is about 20HP. The cheapest improvement of course is intake and exhaust, but the K&N kit is not the way to do it. For example, take a grand marquis or crown vic. Put on a dual exhaust, free flow mufflers and an airbox and MAF from a Marauder and programming and you will get a huge improvement in performance, and economy wont be hurt unless you keep your foot in it.

As far as what huffman stated, on any engine, ingestion of dirt is NOT good no matter how fine. On a diesel with a turbo, the term dusted comes up a lot, that is when a turbo fails due to the ingestion of dirt, and usually from either a leaking airbox, or a poor filter. The way to tell is to remove the filter and run your fingers around the intake behind the filter. If you get any dirt on your finger, your filter is not working and your engine is ingesting dirt which is not good at all, no matter how fine it is, in fact the finer the dirt, the more damage it can do since it can be suspended in the oil, get past the filter and wind up between bearing surfaces. Oil Filters only filter up to a certain point, and unless you have a bypass filter system install, fine dirt that can get past a K&N, and there will be dirt getting past it until it gets dirty enough, will get into your oil and past your oil filter. K&N Filters are great for racing applications where the engines are torn down regularly and excel in those fields, but for the normal person in daily driving, until that filter gets dirty, it can cause a potential engine problem. Those FIPK are mainly for show, they wont give you anything more than a stock system will. start with the exhaust first, and I dont mean put on a fart can. A good system is either cat back or headers back.

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