yea they are pretty damn quiet. I think the lowest part of the ART pipes are the ends of the side-branch resonators.
Since the ART pipes use the oem donut gastket, they can pivot on that to change the pipe's angle relative to the header. For example: if you tightened the bottom two bolts on the triangular flange, then went to tighten the top bolt, it would result in the ART pipe being angled downwards too much. Its best to get the pipes sitting how you want them, then tighten the 3 bolts on the flange equally.
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some mods
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