Thanks for the feedback. I know basically nothing about exhaust, so to keep it simple, would the 2.5 inch dynomax work well for a set up that is 2.5 inch from the manifold and maybe that or 2.25 behind the muffler? Another concerned with the 2.5 inch was the shop having to bend them. Not sure if anyone makes reasonable pre-bent pipes for the slant 6. Thanks again.