Okay so I have been looking at the newest Summit Racing book for parts to customize and increase the performance of a mustang. I am thinking about purchasing a Superchips performance programmer for my V6. Its claims to add around 50 ponies and 35 ft-lbs of torque. Combine that with a BBK cold air intake and new exhaust, which should add 15-20 more ponies, and my V6 would turn into a GT of the same era... Sounds good right? Well what I want to know is how exactly the programmers work. The price is $350. Would it really be worth the cost of buying? And do they have to stay plugged in to the OBD II port in order to work??