About a year ago Jay Bittle started the GT project. I had them on my car in Newport Beach last summer. My car had the mid-range headers, cats and stock muffler. On the first dyno my car was stock and made 485hp and 489tq at 12.1 PSI. We used that as the baseline. Jay's guys built a really cool muffler and with the headers, cats, tune, and new muffler, the car produced.... are you ready?...592 hp and 566tq at about the 6000 rpm range, the dyno wouldn't go any faster! Since then I've added a 2.9" pulley on my stock supercharger and now the car has... are you ready?... 621hp and 603tq !!! We're talking rear-wheel hp and tq which is all documented.
Jay's raced Fords for many years, and builds thousands of headers each year for racers and street cars. I went there 'cause he has a reputation for building performance and my numbers prove it. Check out the JBA site and there are youtube audio/video clips of my car. On the right side of the home page there's a Ford GT Heritage... click on it and the info is there.
www.jbaheaders.com
Keep the Greasy Side Down!
:thumbsup