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Even with stock cats the TDX is still loud. Although a fantastic exhaust, I own one too, its far too loud for what he clearly wants. I second a Nismo or Invidia setup on stock cats. The nismo I think is your best bet.
Nismo borla or fuji. For not loud exhausts. But here's the problem. They look stock. Maybe polished tips but they don't look good. And the tips are about the size of stock. You need Atleast 4" tips. Cheapest burnt tip you can find on an exhaust is the gemeni exhaust.