Reading posts about forcing the muffler tailpipe valve to stay open by removing the vacuum hose and plugging it---If you open the rear hatch and remove the drivers side cover (where the DVD and Sat radio go) you will see a small solenoid valve with 2 vacuum hoses attached--the soft hose goes directly to the vacuum pot on the muffler--you can disconnect it at the solenoid valve and put a short piece of plugged hose in the valve output--now you don't have to crawl under the car and if you go for service no one will see the hose with a golf tee stuck in it! Should be goood for about 15 to 20 HP and 3 to 5 MPG by my dyno reading