technical exhaust question
Thread Starter
Pro
Joined: Mar 2006
Posts: 646
Likes: 72
From: EAST TEXAS
technical exhaust question
I am considering putting the stock NPP exhaust mufflers and an aftermarket control system on my 2006 cooupe. But I have one concern I hope can be answered by someone knowledgeble on the subject. As I understand, on the stock NPP system, one flap on each muffler stays shut until a certain rpm is reached at which time these open, which results in a total of four openings for the exhaust. Also, if an aftermarket control system is used, the two flaps can be opened at any rpm for a total of four openings for better sound. But what about going the other way? For example, what if the driver wants the sysem closed in order to be in the "quiet mode" and then runs the engine up to a high rpm at WOT? Would this result in any harmful backpressure or lack of power due to there being only two outlets for the exhaust?
Drifting
Joined: Oct 2007
Posts: 1,565
Likes: 2
From: The Great Pacific Northwest...........I carry a gun cause a cops too heavy.
But what about going the other way? For example, what if the driver wants the sysem closed in order to be in the "quiet mode" and then runs the engine up to a high rpm at WOT? Would this result in any harmful backpressure or lack of power due to there being only two outlets for the exhaust?
I installed Bi-mode mufflers off a 08 Z06 on my 05 along with the NPP in a box. I love this setup.
Pro
Joined: Oct 2008
Posts: 735
Likes: 3
From: New Harmony IN
St. Jude Donor '09
Melting Slicks
Joined: Dec 2004
Posts: 3,250
Likes: 569
From: Margaritaville Daytona
Not an issue
I am considering putting the stock NPP exhaust mufflers and an aftermarket control system on my 2006 cooupe. But I have one concern I hope can be answered by someone knowledgeble on the subject. As I understand, on the stock NPP system, one flap on each muffler stays shut until a certain rpm is reached at which time these open, which results in a total of four openings for the exhaust.
True with OEM mode, for others most use an after market switch to open and close at will.
Also, if an aftermarket control system is used, the two flaps can be opened at any rpm for a total of four openings for better sound. But what about going the other way? For example, what if the driver wants the sysem closed in order to be in the "quiet mode" and then runs the engine up to a high rpm at WOT? Would this result in any harmful backpressure or lack of power due to there being only two outlets for the exhaust?
True with OEM mode, for others most use an after market switch to open and close at will.
Also, if an aftermarket control system is used, the two flaps can be opened at any rpm for a total of four openings for better sound. But what about going the other way? For example, what if the driver wants the sysem closed in order to be in the "quiet mode" and then runs the engine up to a high rpm at WOT? Would this result in any harmful backpressure or lack of power due to there being only two outlets for the exhaust?
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