I did pretty much the same mod a month or so ago and my mileage increased a bit. My mod was more simplistic, though, and did not require any cotting of the air box, which can be very useful, so you can just keep the stock intake and plug it back into the air box if needed.

I meant to do a write up on it. I have some pictures to post up. <img src="/forums/images/graemlins/kewl.gif" alt="" />

'97 Sportage, 4" Lift 1" BL, 31" BAJA CLAWS, Rallye 4000s, Line-Xed Hood, Grille, K&N, 2.25" Exhaust, RS9000s, GPS...

"What is IFS and where can I get some??" (outerlimits4x4.com)