On my 99 Toyota Avalon, the flanges connecting exhaust manifold and downstream pipe has two studs (same as manifold to head)screwed into the upstream flange. The downstream flange is clamped with non-reusable nuts which screw onto the studs. Apparently this is a super duper high strength fastening system required for exhaust service. However, I was wondering what would be wrong with using a couple stainless bolts with lock washers. Believe I could get grade 8.8 at my local hardware store. Not as strong as the factory studs, but maybe strong enough. What do you thin? Thanks.