28 March 2013

Manual NPP

NPP is the RPO code from GM for the dual mode exhaust on a sixth generation Corvette.

There are butterfly valves in the mufflers that, in stock form, open at about 3,000 rpm allowing the exhaust to bypass the muffler.

This gives a small horsepower boost over the base exhaust, six horsepower.

With the valves closed it's as loud as a Cadillac.

I thought this was a performance car!

So I put a push switch in my dead pedal.




Now you can hear the 436hp of American Canadian LS3 at idle!


Posted by Angus McThag at 20:10
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2 comments:

  1. JD Rush29 March, 2013 14:54

    +1

    My friend Ace had a 6.0L Monaro, I mean "GTO" with Kooks, "cats," Corsa sport exhaust and a nasty cam (and other mods, 480 at the wheels). It would blow your ear drums out at full song on the outside. Nice on the inside, though. Then again, I've been rocking dumped exhaust on my truck long enough that I think I've caused hearing damage.

    ReplyDelete
  2. Angus McThag29 March, 2013 23:16

    What? ;)

    ReplyDelete

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