Need to pick out some headers for 2002 Mustang GT?

Depends on what you want, shorty's keep the low end torque where as the long tubes help more in the upper rpm's. If you do buy long tubes you will have to buy a new mid pipe since long tubes come down next to the trans where the shorty's are up still by the motor(basically what you have now) If going with long tubes i highly suggest getting kooks(expensive but worth it) or hookers(step down from kooks) cause they allow you do drop the trans with the headers in place where as other brands you have to take off the penger side header which is a BIG pain to do since you have to support the motor and drop the k-member.