my muffler was changed to trust muffler,the sound changed into so lousy loud sound,like harley davidson. so,to S2k owner,don't change the muffler. remain the original twin pipe,the pickup would drop once the muffler is changed!! more important,u won't hear any engine sound if ur muffler is too loud,so u won't know when to shift gear,coz u r not looking at the dashboard when u race,do u?