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nut size for header pipe to manifold 700

The exhaust on my '91 745 n/a has been noisy since I got it. I finally installed the Starla, cat back kit from FCP Groton. It's a good, solid, easy to install kit though mine was missing one easily obtained clamp. Unfortunately, I still have a lot of exhaust noise up front. In looking what I would have to do to replace the gasgets, I found that there are NO nuts on the two studs holding the header pipe to the exhaust manifold. I bet that will make anyone noisy. I know the gasket there may be shot, but I would like to see how it sounds if it's actually tight first. Does anyone have a good idea what size nuts go on those studs so I can pick some up without too much trial and error ? Thanks!
--
Andy in St. Paul, '91 745 Regina 190K mi, '89 244 137K, '87 245 RIP






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