stupid question :D
 

Just got my first mustang, the guy i got it from said he installed custom exhaust, i didn`t pay too much attention because i was probably too excited to get home with my new mustang :D
anyway... how do i know what kind of pipes are they and if they are any good?
maybe someone could tell from a video?
http://www.youtube.com/watch?v=nq-MGSrbLZY
thanks!