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Most people on here will say 2.5" but IMO you're better sticking closer to 2". Yes, most of the aftermarket exhausts are 2.5" but people forget that exhausts cater for people running 230bhp plus. Therefore if you're running less i.e. under 200bhp you'd be better sticking with 2 to 2.25".
Gone for 55mm myself which is 2.167", hoping it should be spot on.