Nice pipe for an AT1 on eBay right now. I have the same pipe on my CT1B and I like it. I’m tempted to take a swing at it in case I ever get an AT1. 

eBay item number:156014845060

ebay link to pipe

 

Photos show a nice looking pipe for that money…
Sneezles61

Less than an hour and no bids???

Maybe it’s too specific?
Sneezles61

Yes, rare item, but equally small market. 

Pretty sure the AT1 and CT1 aftermarket pipes were the same. 

I have a few different aftermarket pipes.  They sure run good.  I'm not sure any have a spark arrester which is required most places off road here.  If I ran exclusively on the street or if they didn't check I'd use them more. 

Yes, Enduronut said the same thing about the AT1 and CT1 being the same. I reached out to the seller and offered $100 and said I would come pick it up to save them the hassles of shipping, but they declined. It will be back on the auction block soon, if not already.

You might contact Rick C or Brown Shoe (Scott). They came down and cleaned out my garage and among all the items were two CT/AT expansion chambers.

Hate to hijack the thread here, Bill.
But I will probably be using one of the pipes on my newly acquired ( some have called it a boat anchor )
AHEM ... bike.  
Shoe ( Scott ) and I took a tour to the Long Beach Motorcycle Swap Meet on Sunday.
I made sure NOT to bring way too much money , $83 to be exact so I wouldn't go crazy and pick up something I really do not have room for. My buddy Johnny had a spot to sell some of his parts, so after spending a total of a whooping $ 34, we went back to see how Johnny was doing .Had a beer and milled around.
The guy in the next booth came over and said, " someone over in the next aisle had an AT for sale now for $20 bucks and we should go check it out!
Well I walk passed it earlier , chuckled and shook my head and promptly left the area.
Now Scott and I went over to take a look once more, sure enough..hand written on the tank was $20.
Scott and I agreed that there was only 2 usable part on it. Yet we stayed for about 8 minutes mumbling back and forth. 
The owner came over and said, " for you guys, Take it , it's for free ! I don't wanna load it or see it again !!
It's FREE ....get it outta my sight ! "
O.K I said, came home and checked the VIN #
a 1973 ATMX. numbers matching.
So I will need one of the pipes.
 

Good for you. Great story. I posted the original link thinking someone on the forum would grab it, but nobody did. I don’t have an AT, so I didn’t need the pipe. But I threw an offer at it simply because good never used pipes are getting very hard to find and are rarely under $200 and often closer to $500. It didn’t sell and they will put it up for bid again soon.