I have a 04' Mustang GT auto tranny...now i was looking at BBK headers and i dont know but someone said that i cant use long tube headers on an auto tranny...is that true?....

 

You can't use BBK headers on an auto. The 4R70W tranny is too wide for the headers to fit without modification to the tranny oil pan. Afterwards you will not be able to drop your tranny without removing the headers (or at least one side). Hedman and MAC make longtubes mustang that will work for autos as well as manuals. I have the Hedman torkstep longtubes. They work fine and I can work on my tranny without removing either header.