guys i saw these stacks on sunday aug.16., and they were smooth...the way he built them will not affect his tune...all he did was turn his muffler around and got a t and connected these "STACKS to the t..and ran a rubber hose from the muffler to the stacks....it looked sweet when he was running it at the event the blue smoke was boiling out like a big rig. and he was turning alot of heads...i will look and see how the pics turned out when i get my camera recharged. and during the long jump comp...i will give this kid credit...his truck flew apart but it looked like dennis anderson and tom meents doing a freestyle....everyone was screaming and he kept jumping it and tearing it apart...they...the event staff finally shut him down when his header came off but he wanted to keep going...this kid has heart.