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Not sure if its a RM10A but Ive had a one piece fujitsubo on my V2 impreza for four years, excellent performer. My car made 370 with a standard 2.5 inch flange. Its passed every track noise test at around 96db. I've recently fitted a 3" flange in anticipation of a big power build. Superb quality exhaust that's too quiet for the retail park racers hence used ones come up for sale at reasonable prices.