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I have a turbo muffler on my truck, it sounds just awesome for a 4 cylinder. It roars but it's still soft enough so you don't have it ringing in your ears when driving around.
i run a dynomax on the 240sx. i like it a lot. Probably similar to that Summit muffler except maybe : "these mufflers produced 21 horsepower more than a leading competitor's muffler"