Hi Retrac,
You have to look at the whole picture. From input to output. a larger MAF really isn't going to do much unless you get rid of everything else that restricts the flow all the way through. Now Headers are known to be the biggest improvement in flow and HP also( aside from a turbo), finished off by the cat-back system. On the input side, the holes in the air box or a KKM type set up should come next,the larger MAF and Throttle. now the whole thing will work much better. I doubt that just a larger MAF will increase your HP by 10HP, especially if that is all you've done to the input/exhust system. Performance Products is a reputable place, but that is the claim of the manufacture, not Performance Products. They are just quoting the manufacture. Don't believe everything a manufacture says about their product. Tornado Air Management system claims to give you 5 to 10 HP and better gas milage, but I have yet to see any proof of that, and in fact P.M. and other independent labs have proven that is isn't true.
We all would like to find one thing that would improve our truck, but the fact is that it isn't just one thing. It's one thing leads to another, and another, and still another, until you have gone through the whole damn engine. Sorry this is so long. Look at it this way, if you can't sleep, just log on and read this. You'll be asleep in no time. Dead Link Removed Hope this helps.
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Happy Wheelin'
Ray L. Dead Link Removed
97 XLT 4X4 4.0L SOHC
[This message has been edited by Ray Lobato (edited 09-20-1999).]