For delkevic exhaust info do a KZR search for
Delkevic. Many of the posts are from just a few topics, so you can wend your way thru the hits rather quickly & also focus on the stuff about the KZ650 & 750. Here are a few topics & a couple of quotes.
Delkevic pipes - Z1 Enterprises
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1980 KZ750 E1
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1977 KZ650
By vadersdad: I just received Mine last evening. 3 days from order to delivery. I was not disappointed in the Pipe. The welds are flawless, the finish Top notch. (1980 Kz750E1)
By etbike3135: I installed one this weekend. Ill get some more pics. I really like the quality of the exhaust. It even comes with gaskets. Sounds great too, very deep and much louder then a standard Kerker. Couple of things I noticed. It hangs a bit low under the bike, Kerker is tucked up more. I think it makes it easy to bash the bottom of this exhaust. Also the megaphone comes right out at the axle bolt so if you want to get the rear tire off you'll have to take the megaphone off.(Z1, KZ1000 or 1100?)