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do the nuts vibrate off the turbo-side of the studs first? I've used Megan manifolds on all my SRs, and what I have found works is:
- loc-tite the studs in with special high-temp loctite, which doesn't really do much at this temp anyway, but every bit helps
- put a nut on the top of all 4 studs - for the one under the collector, I JB welded a shaved nut on
- use the OEM locking clips on both sets of nuts (above and below)
If anything shakes loose, of if you break studs, you have a more serious vibration issue, probably coming from using a downpipe without a flex section. I had a turbo elbow break on me, and Steve and Calvin at Megan both said that switching to the newer downpipe with a flex section eliminates all those vibration-caused issues.
If the only problem is the studs coming loose from the manifold side (and the nuts stay on from the turbo side), then I'd just JB Weld (or tack weld) nuts onto the studs on the top - once those studs are in there, theres no need for them to come out.
Hope that helps, and dont give up! =D
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