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The piping needs to be slightly different for the OPF which may be the issue. The exhaust pipe runs down the edge of the OPF, on the secondary cats it goes down the middle. If you compare the underside of an EU/US car you will see the difference. From other posts i've seen the Miltek needs some welding to fit on US cars.
Side note, but OPF's are so lame. All modern EU cars are ridiculously choked by their exhausts.
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