damn it!! I hated whenever this topic show up, you people just don't get it. DO YOU ALL REALLY THINK BY ADDING AN EXHUAST SYSTEM WILL GAIN HP? Answere? YES. How much hp? NOT ENOUGH FOR YOU TO FEEL THE DIFFERENT. 2-5 hp gain is not enough to feel a different on a 240hp car, think about it.................... And definitely not enough hp gain to spent 750-1,000 USD. UNLESSSSSSSSSS, SOUNDDDDD is what you looking for, ACTUALLY SOUND AND LOOK WILL BE THE ONLY NOTICEABLE DIFFERENT.
Honestly, for 1,000 USD I recommend getting a fully adjustable COILOVER SYSTEM, it'll cost a little bit more, but belive me your money is well spent. Coilover will improve your handling and acceleration due to stiffer shocks and springs, not to mention they're fully adjustable from height to stiffness.
I do agreed that the Invidia is loud, i'ved heard it, in my opinion Comptech has the best sound value!!!!
GO TO THIS SITE AND DL THE DYNO VIDEO THIS S2000 SOUND LIKE AN F1 CAR. Like I said before, sound and look will be the only major gain.
http://www.killer-f20c.com/exhaust.html