It cost me 1200 to have my OBX longtube headers installed. They figured 10 hours @ $100/hr, an O2 sensor, and a pipe needed to be extended to hook up to the Magnaflow exhaust on my Expedition. I had 2 broken studs prior to the dealer working on my truck, not sure how many more they snapped, but I sprayed them with PB Blaster for 2 weeks before taking it in.
Kinda shocked at the price, but it was worth it knowing everything is taken care of... I was told it would have been more had I decided to put a new manifold on the passenger side! More vroom, more power, and hopefully more MPG's too!