those things look cool as hell! not to be a troll,but whats the point of having 2 pipes on a twin?if the cylinders fire 180 degrees apart, in theory only 1 cylinder at a time should be using the pipe.i saw twin pipes for a 550 many years ago and this and the added mode of failure + the extra weight made it to where it was a cool novelty,but not very practical.i think its great that tbm is trying innovative things,but i thought that this has already been tried and failed,and that multiple pipes were only useful on triples.if i'm missing something somewhere,somebody explain it to me.it certainly looks cool though, imagine 2 tnt chambers on a superjet.that price looks about right.