Anybody running one? Or any other system on a 4 that you could recommend. I'm interested in HP increase and not a lot of extra sound, as 4's don't always sound that great with performance systems. And I don't want the "ricer" sound for sure.

Took a trip recently to Oregon from California, and the truck struggled a few times in the mountains climbing the steeper hill. The truck is just fine most of the time since my wife mostly uses it for commuting and light hauling of people and things. I sometimes wish we had the V6, but the price on this '02 closeout was just too hard to pass up. And we haven't had a tank under 20 MPG since we bought it, and generally get in the 22-24 range on the freeway. Comes in handy considering the gas prices around here now. Just looking for a few extra HP's for those times it needs it, and like the Magnaflow system on my Mustang Cobra. Magnaflow claims at least an 8% increase, and would like to know if that's reasonable from someone who might have this combo.

Thanks for any input you can give.