***First of all I don't want to hear about how nobody should put aftermarket exhaust on their Prius. People can do whatever they want. This is to discuss the exhaust itself not weather or not it should be used. *** There are a few exhaust options for the Prius, the only two I know about are the Gandor and the Tom's exhaust. I'm just curious is there is any mileage improvement or decrease with the exhaust. Also what it sounds like. Loud, quiet, etc? I know the ICE isn't always running but honestly people it's running more often then it's not when the car is in use. I've got 44k miles on my 2006. I'm just thinking about getting some exhaust to make it look and sound slightly cooler. I don't want rims because I actually like the stockers and I wouldn't want to see my MPG drop.