http://supersprintlabs.com/portfolio...aust-rd-notes/
I found the above blog. So there are now 3 types of Supersprint mufflers. The sport, race and valved:
The silencers are available in 3 versions:
SPORT
TUV approved exhaust: the best compromise of comfort and sportiness. Fitted alone they’ll give a deeper tone at low revs and a sportier, more exotic tone at high revs, but nothing extreme. Depending on what other Supersprint components they are coupled with the sound will be more or less aggressive.
RACE
These mufflers offer the most extreme sound, sacrificing some comfort for excitement.
VALVED
These mufflers are equipped with pneumatic actuated bypass valves that connect to the OEM control system. They are quiet and refined when the valves are closed, and gets wilder and more aggressive when they are open.
BTW they want $5,440 to $5,610 for the valved mufflers (price is dependent on chrome or black tip finish)....ouch!:
http://www.supersprint-usa.com/produ...5/Default.aspx