Question. For the last 11 years I have always had a Fox style Mustang. I just purchase a '99 Mercury Grand Marquis LS cause I needed the room for the kids. It has single exhaust. I wanted to know if you knew anyone who sold performance parts OR what interchanges with it from a Mustang? This is my first Mod motor so its all new to me. I would like to start on the exhaust first and the the motor.