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FWIW the engines we build,3.5 and 3.7 liter "Duratec" use stainless exhaust manifold studs .

Not really .You have to remember I work in the auto industry .My father was the metals guy .That plus the fact with the family name alone it goes back to the miggle ages .

Most if not all torx or allen heads are grade 8 SAE.

I'm not certain you could find a short M6 torx head anyway without buying a box full .

Another tid bit .The original tap magic contained triclorethane which cooled by rapid evaporization which was combined with a light oil in the mixture . It was found that tri clor was a carcinagenic in large doses so it's no longer in the mix .That aside straight tri clor is a wonderfull fluid...

That's it Magnus .Actually I've used a lot of things,WD -40,hand creme,cutting oil .It's just the fact we have cans of tap magic galore at work .Cheap is good free is better .:D

More on screws. A screw by definition is an inclined plane around the outer circumferance of a cylinder .Properly torqued it acts like an extension spring under tension .The rule of thump is in steel it needs around 1 times the diameter of the bolt for internal threads ,cast iron 2 times and...

"tap magic "for aluminum .If not that the inorganic coolant we run at work i in the CNC machines .

Here's the kicker .As designed those muffler bolts where M5 by 20 mm .Proper design on a threaded fastener in aluminum is 4 times the bolt diameter of tread engagement .As built it's not even close .

I think that saw originally had a bellville serrated type lock washer on it .Problem being if you used torx head 6 mm I don't think there's enough room to get one in . After the fact but a tip .Usually with a wallered out 5 mm hole if you run a spiral point tap through the damaged hole...