Nope: It's pretty much plug in and not worry about it. I put one in my 02 without any other mods and it made it way more enjoyable to drive. Mine was an automatic and it cut shifting around town on hills and such in half. Just more torque and less foot down on the pedal. If you plan on doing other mods it's probably not the right choice but if you just want it a little better it will work great. It was a long time ago so I can't remember if fuel mileage improved but I imagine it did.