The HKS hyper/ Hiper muffler is a N1 style muffler. The sound is much sportier that the Remus, thus the change from Remus to HKS. There is 3% expected gain in power.

Built in Germany the Remus brand is well known throughout the world. I purchased  the IS200 turbo design once it came out in ealry 2000. The tone is a deep sound, and is quite thrilling to hear. Overall a nice bassy sound but crackles at medium rev. There is 2.5kw gain expected with the Remus.