How does such aftermarket exhaust systems add 40 HP and 2 MPG? I thought everything in life has compromise, more power less MPG. If it is that easy some small aftermarket shops can work magic, why can't the giant GM/Hummer with hundreds of technicians, hundreds of million of dollars in research and purchasing power do that? They can easily drop some petty cash and buy the wonder technology outright. Imagine if an auto maker can add 40HP and more MPG across the lineup, certainly will bring publicity, customers and profit. Frankly I don't know anything about all these aftermarket wonder stuffs, I am doubting them simply from a logical point of [img]/infopop/emoticons/icon_confused.gif[/img]view.
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