W205 C63 C63S FI Catless Downpipe Black Friday Special! $1250 shipped!
Both the secondary and primary cats are on the downpipes, so even using the bottom half of these downpipes for the secondary cat delete will require cutting and welding. An exhaust shop would be much cheaper... unless a vendor decides to start selling a secondary cat delete pipe, though you'll still need cutting and welding.
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