i have dyno max mufflers with long tubes and off road h-pipe and dynomax catback that sounds realy good. when i first put my headers on i ran it will a turn down and it sounded good but it was too loud for me at crusing speed. it seems like i had to have my raido all the way up to hear anything. with my current set up it sounds great when crusing and is loud as almost any other stang that i have heard at full throttle.