It's actually pretty simple. There are about 7(?) allen head or torx head screws on top of your throttle body, (sorry, I just don't want to run out there right now to verify it ) Take those off and the top should lift right off. Sorry, but i'm having a brain fart right now, there should be a spring in there and it sits in a spring seat. put the quarter (an actual quarter) in there, not the diaphragm end, and put it all back together. Before you put everything back together, start the car and make sure it doesn't leak. Mine did if it does leak you have to get a fuel pressure kit it comes with a diaphragm and gaskets for around $26.00. I'm sorry I can't be more specific but it's been a while. I noticed an improvement and no effect on mileage, idle or driveability.