Dual exhaust won't do you much good unless you're going to modify the engine big time. Seems like I read somewhere that a single 2" exhaust is good for up to somewhere around 300HP but I might be off on that figure. I don't know if they were talking about a straight pipe or muffler and cat included. I do remember it was a higher horsepower figure than I thought it should be.
Going by someone else's seat of the pants experience is dangerous and expensive. You don't really know if you've improved power unless you dyno it before and after. You don't know what it will do with the mileage figure unless you keep accurate mileage records for several thousand miles before or after. And like others have said, you have the computer and it's sensors to deal with. Jim
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