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For the JCW exhuast the early one is NLA on the rear section to 1/2004, the 1/2004 on is the same excpet the hangers on the side , which will need bent. If you have a pre 1/2004 Cooper S
I have a Milltek with Cat, loud enough that I can hear its rumble, not so much so that its annoying on the highway. Throttle response is superb (15% SC pulley, 2% crank pulley, JCW Intake)