Long tubes and keep NPP?
Thread Starter
Racer
Joined: Aug 2007
Posts: 349
Likes: 3
From: Houston Texas
St. Jude Donor '10-'12-'13-'14
Long tubes and keep NPP?
I am considering either a head/cam or vortec supercharger upgrade and want to know if there is a way to keep the NPP while adding long tube headers (2009 LS3). I would like to keep the option of going "quiet" when I leave my house at 5:00am every morning. 
Melting Slicks
Joined: Feb 2004
Posts: 3,307
Likes: 110
From: Tucson AZ
When you install headers you must also purchase the matching mid pipes
Your stock exhaust is in four sections:
Cast iron manifolds
Catalytic converters
Mid pipes under the tunnel
Over the axle pipes and mufflers
When you install headers you must also purchase the matching mid pipes, with or without cats. This will replace your original cast iron manifolds, cats, and mid pipes and join up with your NPP over axle pipes just in front of the rear axle.
Cast iron manifolds
Catalytic converters
Mid pipes under the tunnel
Over the axle pipes and mufflers
When you install headers you must also purchase the matching mid pipes, with or without cats. This will replace your original cast iron manifolds, cats, and mid pipes and join up with your NPP over axle pipes just in front of the rear axle.
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,684
From: Southeast TX
I have the NPP's with LG's long tube pro's and their catless midpipes. It's a simple bolt together setup. Sounds good and makes good power. I have the Mild2Wild controller. Can't sneak away from the house because my setup starts in the "wild" mode every time. You can quickly go to mild, but not instantly. With long tubes, cam, no cats, and the controller on wild, it's a little loud on start up. There might be options now that allow starting in the mild mode.
Racer
Joined: Aug 2007
Posts: 469
Likes: 7
From: OC California
I have LG Streets, NPP exhaust, and the Mild2Wild on my car and couldnt be happier!
What a great forum BTW. Someones asks a question and the vendors for all the great products come in to help out, awesome.
Happy holidays!
What a great forum BTW. Someones asks a question and the vendors for all the great products come in to help out, awesome.
Happy holidays!
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Heel & Toe
Joined: Apr 2008
Posts: 22
Likes: 0
I have the NPP's with LG's long tube pro's and their catless midpipes. It's a simple bolt together setup. Sounds good and makes good power. I have the Mild2Wild controller. Can't sneak away from the house because my setup starts in the "wild" mode every time. You can quickly go to mild, but not instantly. With long tubes, cam, no cats, and the controller on wild, it's a little loud on start up. There might be options now that allow starting in the mild mode.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Unless you want to change the way your car sounds there is no real reason to change the mufflers. For instance if you swap them out to a set of high flowing Corsas, the power gains would be negliable at best but the sound is awesome, especially if you drop in a LG X3 camshaft into the engine 
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,684
From: Southeast TX
What is involved? I'm also interested in being able to start up in the mild mode. I'm sure others are too. I have the NPP in a box lite currently.
