I had the OEM trapezoidal pipe kit installed and that effectively made it louder, which I wasn't expecting. So much so that people would routinely ask me if something was wrong with my car. I think most people don't expect a girl to own a car with loud exhaust.
When I asked my SA about it later he said that the kit removes the diverter (is that what it's called?). Anyway, I think the effect is the same as the golf tee mod.
Those pipes were great and only cost ~$750 to purchase and install.
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