Getting the exact length right with bolts is tricky.plus you really can't ensure they won't rattle loose.the copper nut is used to ensure that doesn't happen.another option is to use blue loctite and thread it on then pull the nut, let it air dry then put the stud in and nut over it.you don't want it permanent so letting it dry gives it a snug connection without locking in place
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C2 stage 2 TURBO!!! ACHTUNG!!! 2.5liter 5cylinder contents under pressure!!!