I am selling a Steeda High Capacity Heat Exchanger. It fit the 05-09 Mustang and GT500, Steeda’s part number 555-3706 – they sell new for $472.45. Here’s the link to Steeda’s web site http://www.steeda.com/store/steeda-high-capacity-heat-exchanger-ford-mustang.html Steeda's in house engineered high efficiency heat exchanger is the perfect upgrade for the supercharged Shelby GT500, Magnacharger, Whipple, or Roush supercharged GT. Product Benefits • 166% larger coolant capacity • Reduced air charge temperatures • Increased horsepower under all conditions! $300 + shipping