You are right WWJDRV. I put one on my last car, an '02 PT Cruiser because the K&N site said that you would get an increase in mileage as well as horsepower. I never did get the increase in milege but on HP, yes. As well as a very cool 'throttly' sound on acceleration. I might do it again on the HCH just to see.

I have one on my '99 Suburban too.