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sounds like it will work as long as all components are the same pipe diameter otherwise your muffler shop will need to throw in some reducers to make up the difference in diameters
you'd be better off getting the headers, the twin loop muffler and going to the workshop with them all and having them throw in a cat and do the piping
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i have n*power 4-2-1 header > 2.5" magnaflow cat > 2.5" catback with one hotdog resonator > 2.5" Xforce S12 Twinloop and its a good system
the cat gives off a bit of a buzz - and the entire system is stainless so it does sound a bit tinny - but for a 2.5" on a D series its damn good
i would go 2.25" if u can tho
