I had made a TDX v1 clone exhaust too, except mine used a dual in/dual out X-pipe muffler. It sounded very similar to the TDX v1. I would probably have just bought a TDX v2 if I had a coupe, but I have a sedan and the exhaust options are extremely limited so I decided to go custom. Here's how close they sounded:

TDX v1 w/ ART pipes:

My custom exhaust w/ ART pipes:

I can't tell a difference between them... But after driving around with this for a year I decided I wanted to go with something more quiet at WOT. Got sick of watching for cops every time I wanted to step on the gas. So, I added 5" Magnaflow round mufflers in the back. Still sounds awesome but I'm no longer a ticket waiting to happen

Guess I'm getting old.