I to have purchased an after market car back for my 1998 boxster. You have to remove the bumper to get to the top hanger bolts on the OEM muffler. Depending on the brand of muffler you bought, there should be a hanger on the muffler (a lot smaller/skinnier due to the much decreased weight) that will fit into the top where the OEM muffler hung from. So you are going from about 4 to 6 bolts to 2 bolts if im correct. I haven't tackled mine due to the amount of rust on the cats, U piped and mid pipes. Any suggestions on getting the OEM muffler off??? Hope i helped you out some.
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