I thought upgrading my engine mount carb and exhaust studs to 8.8 was a good idea since I couldn't find any metric allrod close but I've read since I've done this that the 8.8 bolts can snap because there too hard and brittle. Plus they would be really hard to get out with an easy-out because of there hardness. Is this true, do I need to remove them and replace with grade 5 hardware?