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Do you think you need to order the exhaust system option since you can control the sound with the selector
 

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Do you think you need to order the exhaust system option since you can control the sound with the selector
I ordered it for that as well as the 5 extra HP and 5 extra ft lbs of torque. While I realize that is not alot of HP gain If you saw the K&N Dyno test they were showing as much as another 15 HP gain by replacing the stock air filter with a K&N one. I will do that so I figure I should be up to 475 HP soon :)
 

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I ordered it for that as well as the 5 extra HP and 5 extra ft lbs of torque. While I realize that is not alot of HP gain If you saw the K&N Dyno test they were showing as much as another 15 HP gain by replacing the stock air filter with a K&N one. I will do that so I figure I should be up to 475 HP soon :)
please wait...k&N are notorious for stretching the truth for Hp....wait for CAI, Roto-Fab or Halltech and a few other top intake people to do their thing in a few months...
 

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Do you think you need to order the exhaust system option since you can control the sound with the selector
The NPP optional exhaust has three advantages (and one, its $1195 cost, disadvantage).
Advantages: Four level adjustable exhaust, with louder loudest level than the standard exhaust.
Whereas the standard exhaust is 11% freer flowing (11% less back pressure) that the C6's, the NPP exhaust is much more free flowing, with 27% decreased back pressure;
Comes with four (4), 4" polished exhaust tips, compared with standard four (4), 3" non polished tips.
And while it is confirmed that you have four different exhaust levels with the NPP (with the standard Driver mode selector), we're still trying to confirm whether the car, without the NPP option, has only two or more-than-that exhaust levels.

Can anyone confirm the number of exhaust levels on the non-NPP standard exhaust?
 

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Can anyone confirm the number of exhaust levels on the non-NPP standard exhaust?
It's my understanding the non-NPP exhaust has ONE exhaust level. How could it have any more, it does not include any valving to modify sound, it's just a simple muffler with 2 exhaust tubes that split into 4 tips. Don't try and make the electronics more magical they they already appear. Electronics alone can't control sound if the muffler has no movable baffles.

The NPP exhaust has 4 exhaust tubes directly feeding 4 tips. The outer 2 tubes have electronically actuated valves to open and close them. Internally, the muffler is also chambered differently to accommodate the 2 additional; exhaust tubes.
 
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