Is the 2002 v6 mustang and the 2002 v8 mustang exhaust inerchangeable?

Answer 1

The exhaust on a V8 differs from that on a V6 due to the fact that a V8 uses an "X"pipe to connect the mid-pipe to the cat-back while a V6 uses a "Y" pipe to connect this mid-pipe to the cat-back. This is because V6s only come with one muffler/tip, where as the V8 comes with two.

HOWEVER, the V8 cat-back section is interchangeable with the V6 if you use something like the Mustang V6 dual exhaust adapter kit. These kits can be can be found here:
http://www.americanmuscle.com/v6duexadkit1.html
(copy/paste to see the product)