Don't think I needed to retune, but I did anyways. I already had my 93 race tune in when I installed the headers and my engine light didn't come on while driving the whole day, but I figured it would be safe to get it retuned so I did it the next day. As for performance I could feel a slight decrease in torque, but when you let it rip on the freeway it makes up for it. Overall the way the car drives wasn't affected too much.
2011 3.7L Black | Automatic
JLT CAI | BAMA Tune | Borla LT Headers & O/R X-Pipe | Borla ATAK Catback | 3.73 Gears