A fellow Hf expert surfaces,
when I bought my car 4 years ago, it still had the original hf spec resonator and muffler (A and B pipe) Although, they were so gone and in need of replacement. I purchased a walker resonator portion and a Bosal muffler. The diameter of the old and new exhausts were 1.5 inches.
Fast forward to the present the Bosal exhaust failed and I'm just looking for a up-rated replacement. I've come to the conclusion that both DX and HF pipe diameters appear to be the same at least with brands such as Bosal/Walker.
According to the research on the exhaust I've settled on, it's as close to Honda as you can get. With 1.5 in. diameter on both inlet and outlet pipes, top heat shield, and their apparent 3 stage quiet internal baffles (questionable) we will see.
Link:http://www.rockauto.com/info/Walker/Det ... -11020.jpg