Check this out! I found it online on Anderson Ford's site. It's the dyno and writeup in Muscle Mustang and Fast fords. Axle backs, x-pipes
http://www.andersonfordmotorsport.com/media/exhshoot2.htm
http://www.andersonfordmotorsport.com/media/exhshoot1.htm
http://www.andersonfordmotorsport.com/media/exhshoot3.htm
http://www.andersonfordmotorsport.com/media/exhshoot2.htm
http://www.andersonfordmotorsport.com/media/exhshoot1.htm
http://www.andersonfordmotorsport.com/media/exhshoot3.htm