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Old 08-11-2014, 05:55 AM   #1
sub zero

 
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NPP mufflers ?

I swap my stock mufflers with NPP for ZL1 used , now it's open all the time and i don't like the sound it's too loud but other thing i feel the power become weak !! mybe that because no pressure !! ..

There is a way i can connect them with the throttle body to control it by driving and i'll do it , but before that i want to be sure if that true when all of valves open they gonna effect on power of the car ?
any one have same issue ?
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Old 08-11-2014, 06:57 AM   #2
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There is no way that the exhaust flaps being open will affect your power at all. As far as controlling the flaps, your easiest solution is to close the flaps by maybe wrapping some wire around the actuator lever to hold it closed all the time.

I am not aware of anyone running vac lines to the engine to have it function like stock, but I am sure it is possible.
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Old 08-11-2014, 07:02 AM   #3
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There is no way that the exhaust flaps being open will affect your power at all. As far as controlling the flaps, your easiest solution is to close the flaps by maybe wrapping some wire around the actuator lever to hold it closed all the time.

I am not aware of anyone running vac lines to the engine to have it function like stock, but I am sure it is possible.
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Old 08-11-2014, 11:26 AM   #4
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I'll go back to the tuner to chek if any think changed with tune ..

I'll try close them temporary also ..

Here the thread talking about connecting them with throttle i found http://www.camaro5.com/forums/showthread.php?t=314023
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Old 08-11-2014, 12:16 PM   #5
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I did the same thing and may go with the resonated X pipe to quiet it down. But the sound will be more quiet on the outside as well so I may look into corsa or solo with quay tips. Right now I wear headphones when I drive to muffle the cabin noise a little. I can still hear stuff outside but just to quiet the volume down. Wish GM or the dealer could do the whole install for the NPP vacuum.
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Old 08-11-2014, 12:49 PM   #6
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I just ran a vacuum line from the rear of the intake to the actuators. Cost was under 10 dollars, function similar to stock but closed at idle.
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Old 08-11-2014, 01:50 PM   #7
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I found when I installed my npp, the car became too quiet! of course that's coming from a wide open straight pipe. but even still I don't find it loud at all!
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