a $500 intake on a stock headed 5.0 is a complete waste of cash, unless you've already done all the other mods, meaning gears, rear control arms, and the usual bolt ons, THEN you do the intake, then heads as money permits. If you haven't done the gears and control arms, you're throwing your money away. You may gain a tenth or two from an intake swap, but a gear and control arm swap is gonna get you closer to a full half second. Those e7's can't flow enough for a lot of intake. I agree with most of the others, in the fact that if you've got to do it, port the stock lower.