The T1R 70R-EM Sparrow Dual Exhaust system is the best exhaust we have tested for the S2000 in a number of regards. The exhaust has produced the most power on both naturally aspirated factory engine cars as well as cars using forced induction. The exhaust uses large diameter (70mm) 304 stainless tubing, TIG welded, with an inline resonation tube and two large efficient mufflers. The design results in a quiet tone at idle and low load cruising. Step into the throttle, and the exhaust note becomes slightly louder with a nice deep baritone sound. The design has resulted in cancellation of the drone at cruising speeds that is typical with a large diameter exhaust system. This is the exhaust we recommend and use ourselves.