[Acorn]

I have used a couple several years ago. I recall they bolted right up and fit just like the factory units. The only negative thing I remember was the casting finish. Not that bad though. I just took a sanding disk to them to clean them up and to remove the part numbers and the profanity word (China) off them then painted them with some high temp manifold paint.
Once you switch back to ramhorns you will wonder why you ever had headers in the first place.