the only cats in an 05 gt are 1 in uppipe, 2 in downpipe. the downpipe(oem one) consists of two portions, an upper section and a "mid" section. both sections have their own cat. aftermarket downpipes are commonly 1 piece, catted having 1 cat, catless having none. perrin being the exception with selling a 2 portioned aftermarket downpipe(1 cat however) for no good reason other than being perrin being perrin.
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