Ok I ordered the ART exhaust for the mark viii same as tbird exhaust but doesn't come with muff's or doesn't have down tubes to mate with stock exhaust manifolds. However I recieved a full dual exhaust minus the Xpipe( from what I understand and read on his site it comes with one.). My question is To anybody who ordered a art system does the x-pipe come in a seperate box or get does it get shipped at a different time???? I have no clue whats going on...... Nobody at ART is answering the phone. Thanks for any input.