I had the HKS Hiper system on my 98 civ, it has double resonators, beautiful sounding, it was constantly turning heads. I traded the car in and bought my Type R , and used the civic Hiper exhaust (had to cut it 2 inches) and it sounded just as beautiful on the ITR. I still had the Hiper once I went boost, but ended up with a Thermal 3 inch, which sounds phenomenal plus it breathes better with the larger piping.

To sum it up, I loved the HKS, it had dual resonators, sounded fantastic, great performance. Just do it.