Aaen makes an 85-86 pipe. Says they have a strong emphasis on mid-top power. I am not sure of many options for the 85-86 pipes other than aaen and FMF. I would think aaen is better but have no experience. Someone else may know more about these years exhaust availability. Here is a link for you to the site.
http://www.aaenperformance.com/Acces_P4.asp