Sick Z06...
4th Gear Member
Joined: Dec 2007
Posts: 1,278
From: South Dakota
they're meant for noise restrictions only. they open at 3500rpm and will stay open 2 seconds after you go under 3500rpm
5th Gear Member
Joined: May 2006
Posts: 3,427
From: CA
Like others have said, the butterfly valves are strictly for noise reduction. Remember, The Corvette has to appeal to a wide range of people. Some guys like noise but after a while it gets kinda annoying. The car is very quiet...below the set rpm point. But once they open...things start sounding pretty good. Especailly on the inside of the car..
Listen to this video at around 1:42
http://www.youtube.com/watch?v=EEX_KtRiE7E
Listen to this video at around 1:42
http://www.youtube.com/watch?v=EEX_KtRiE7E
2010 Blue Ball Award Recipient
Joined: Dec 2004
Posts: 7,907
From: Eskimo Village, Indiana *No Igloo*
i was actually just thinking about something today..
if my exhaust were stock, I"d probably have things on my car that I need to fix...
as it is, i cant hear ****...ignorance is bliss!
if my exhaust were stock, I"d probably have things on my car that I need to fix...
as it is, i cant hear ****...ignorance is bliss!
4th Gear Member
Joined: Oct 2007
Posts: 1,970
From: Hawthorne, CA
+1 on the valves. The stock C6 without the NPP exhaust is extremely quiet and you can barely hear it. The mufflers on these things are HUGE!!. That is why I went with my Borlas but it is almost too loud...........nah 
