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1 it is not the mufflers that give subaru its rumble its the Header. The older EJ engines ran Unequal Length Headers giving the exhaust gases spaces causing a rumble noise. The new engines such as the FA20 in the WRX have a very different sound compared to even the MY19 STI as the new engines all have Equal Length Headers causing a smoother running exhaust gas thus reducing the rumble. The mufflers simply make the exhaust louder but does not give it a rumble.