I put a Cooler Tubz Stainless intake horn manufactured by one of our members on my '03. I ran a test by starting from 30mph and accelerating to 60mph. With the stock horn I avg'd 8. 5 seconds and with the Cooler tubz I dropped it to 7. 5 seconds. That is a fairly significant increase I would say. The throttle response is definitely faster. You definitely see why an aftermarket intake horn is beneficial after you remove the stock piece. I have a horn to install on my dad's truck. It is similar to mine other than it has a Edge EZ on 40hp and no cool hose. It will be interesting to see how it fairs. I hope the mpg goes up and towing power is increased. Time will tell.