I got a AH system for a gen 1. It will include the removable silencer plug, spring removal tool, mounting bracket, used with slight flat scrap on the 3-4 header about the size of a .25 piece.
I went turbo so I removed the AH, otherwise I would still be using it. I liked that pipe over all others. Looking for $650 plus whatever the shipping is to your place.
I can send pics to anyone interested so you can decide if the flat spot is an issue before purchase. If I thought it was a performance issue I would of replaced the piece long ago as Brocks sells the individual pieces. I just never got around to taking pics, posting in the for sale, etc.
Here is what it sounds like.