I put a Berk Street pipe designed for a 135 on my 128. I cut the flange that bolts up to the resonator off the Berk rear section about a foot up from the flange. Just after the mount that is in front of the rear axle.
This would be a perfect starter set for building your own bolt on resonator back section.
If interested I can shoot you a picture.
Stainless steel. Used but near perfect shape.
