In 03 the engines changed to meet emissions and get more power. An 03 with a 6spd was rated at 305 hp from the factory. Its already got your 02 beat. They went from a electronic controlled rotary pump to High pressure common rail system with electronic controlled injectors. This system is 10x better than the junk VP44 pump on the 98-02 motors. I had an 03 with a 6spd. The truck was pretty stought from the factory. If your truck does have a chip on it then there should be a small black box on the drivers side of the truck on top of the main fuse box under the hood. Most have velcro to hold the box on so that it can be removed easily. If you do not have a chip on it then it is possible that someone put a programer on the truck and never took it off. The only way to tell this is to have it hooked to a computer to read the ECM and tell what programming it has in it. Odds are though its either stock or has a chip. As easy as a programmer is to take on an off I'd say someone would have taken it off if it had one before they sold it. 03 and newer trucks run a lot better than the 02's did like I and others have said though. With yours being an 05 I would say you still have a stock truck. Out of all the 03-early 07 model trucks I've been around 05's always run the best as far as having more power chipped or not. Hope this helps.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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