What is the best mod you’ve ever done to one of your cars? Is your preferred mod performance, looks or utility related? Are you a purist who chooses to never change their cars or someone from the “LS swap everything” crowd?

My favorite mods have to either be the lights or the MR230 pack on the Fiesta ST. But then again, the upgraded rad has allowed me to enjoy AC without overheating. Then again, weathertech mats are nice, but not sure they are a “mod”.