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      07-03-2021, 03:17 PM   #2
m4AY
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Drives: 2015 bmw m4 austin yellow
Join Date: Dec 2017
Location: edmonton alberta

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according to the parts diagram, the m4 gt4 uses catless downpipes, stock secondary cats and a no muffler section. the midpipe I believe is all titanium like the gts m4.

so I'm not sure what the guy is selling. the m3/4 has 2 primary cats, then bolts to 2 secondary cat, then a midepipe to rear muffler section. after the secondary cats is where you cut to install the m performance exhaust or gt4 exhaust.
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