Not sure if this shows, or not yet - have been having a few issues with photobucket.......
http://cgi.ebay.com/ebaymotors/OBX-T...#ht_2886wt_941
Cost is $400.00 The ad says 4/2/1, but it looks a lot more like a long tube 4 to 1. It also appears that the O2 sensor bung is in a place you can't fit an O2 sensor... but a new bung can be added and that one remain closed.
Information is POWER... learn the facts!!
I had a set of these predecessor's sent over nearly a decade ago and they fowled the firewall on a my KE70. Never tried them in an AE86 though.
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