When I did my downpipes I seem to remember coming to the conclusion that ss studs were not a good idea because they can be prone to seizing with the aluminium engine block in some sort of chemical reaction between the two materials. Also recall hearing of reports of them being more brittle and therefore more prone to snapping.
Might worth keeping that in mind ff you go ahead with them - be sure to use plenty of copper grease and use caution when tightening.
Might worth keeping that in mind ff you go ahead with them - be sure to use plenty of copper grease and use caution when tightening.