From what I've been told the relentless reduced to 2.5" after the cat so can go straight on to standard exhaust and the Pipewerx is 2.75" after the cat n will go straight on to a miltek
I went for the pipewerx 3" down pipe and sports cat. Compliments the Milltek nicely. Only issue I had was to bend the heat shield to stop it resonating. This with relentless v4 manifold all together is a thing of beauty.
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