I have a 81 CB750 Custom with 4 to 4 stock pipes, One of which is starting to break down.I can hear stuff rattling around in it.My question is can I drill out the rivits oin the end of them and empty all 4 of them completly out and maybe pop rivit the ends back on ??? How will this affect performance ??? what are the advantages (if any) to a 4 into 2 or 4 into 1 ??? Thanks for any help in advance. F B J
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