I guess I am the exception. I have heard of one Tsudo before it sounded rather well. It was not on a tC though. As for the backpressure debate, it is more about exhaust tuning and exhaust pulse timing. It is easier to hit the "sweet spot" for exhaust scavaging than with a more open exhaust. Yes, it is true that your low-end torque curve will be flat till the exhaust tuning catches up on a big pipe. Easy test.....take your car and completely remove the exhaust and tell me how it runs. Even with some mods and tuning, it still won't have the low-end till you atleast put a header on.
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