Exhaust/Resonator Question

I'm wondering if there are any companies out there that make after market resonators. I have a 2008 Tacoma(V6 4.0L) and I noticed that the stock exhaust manifold connects to a first set of cats, then connects to a second set of cats/resonator which is a "Y" pipe, and then on to the cat back exhaust. The reason why I ask is, I'm about to buy a set of Doug Thorley long tube headers and the resonator looks like it's going to restrict the airflow too much(I don't know..) I've tried calling around to local muffler shops and they don't seem to have an idea what I'm talking about.. Does anyone have any advice on this matter?

 

aero exhaust has resonators

http://www.aeroexhaust.com/index.php/resonators.html

 

Nevermind, I found the "Y" Pipe that I need. www.urdusa.com has just the one I'm looking for.