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hi ,just wondering if it matters to put the exhaust off a 580 on my 670 r.a.ve. engine

hi,im new here,and i was wondering if anyone can give me some info,heres my problem,my friend put a 670 with r.a.v.e. into my formula plus body originally a 580,but he put the exhaust off the 580 on the 670 engine,does this matter,