Custom duals to y pipe

Exhaust manifold has \ bolt mounts and intake has / bolt mounts (front 3, opposite on back 3) so they make a nesting \o/o\o/o\o/o*o\o/o\o/o\o/ pattern . (bolt centerlines are through ports) so you could not use a front triple on the back. Newest castings of Dutras rear has a mounting pad across the entire top and bottom so they can get clamped on either side so they are adaptable to both front and rear mounting.