Well I found a place where you can get custom made dual exhausts for T-maxx, savage, rustler, etc. He makes them for a couple different trucks/boats. I emailed several people who have purchased these exhausts and asked them about peformance and they all had great praise about the pipes. I saw a few pipes like these on the internet and ebay but these are the only ones that I've seen with the back pressure chamber. These pipes give a clean look to your Tmaxx, expecially with the chrome tips. Other colors are available to. Check it out, I will probably be placing an order today.
Geez, if you want a good dual exhaust out the rear, check out Cvec. They include the header and the mount and stuff. I think that would be more worth while.