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05-06-2024, 10:08 AM
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#1 |
          
Drives: 2002 Camaro SS SOM; 2015 Malibu LTZ Join Date: Dec 2010
Location: Queens, NY
Posts: 4,035
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Does anyone make or modify NPP for older applications?
I am currently in the market for a Silverado, and I was pleasantly surprised to find out that Chevy has made NPP available for its 6.2 Silverado. This makes me wish that I could get this exhaust for my TrailBlazer stable mate. What an innovation GM made with this exhaust. It almost negates a need to put on an aftermarket.
I am hoping that one day an aftermarket NPP becomes a reality!
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'02 CAMARO SS SOM; 5.7L LS1/FLS6B
'08 TBSS AWD Black Granite Metallic '15 Malibu LTZ 2LZ Turbo '14 CAMARO ZL1 Blue Ray Metallic |
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05-06-2024, 12:15 PM
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#2 |
Drives: 2010 Turbo LS3 Join Date: Dec 2009
Location: Palm Bay, FL
Posts: 2,761
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NPP uses a vacuum actuated valve to open a more free flowing side of the muffler like a cutout does. I think most guys, when modifying an exhaust just use cutouts. GM did not invent the cutout valve, so if there is demand, you will see it in the aftermarket. Looks like Stainless works has a set up for 2k+. It can be built with cutout valves and a MAP driven controller or even a TPS driven controller. I just sold NPP mufflers to a guy putting them on a 69 Camaro, so the salvage yard might be your best bet, especially if they are going on Silverados now.
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2010 SS - On3 kit with downpipe cutout, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1/1LE brakes.
2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. ZL1 brakes. |
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05-06-2024, 01:26 PM
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#3 |
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Anthony S
Drives: 2011 chevrolet camaro 2ss/rs Join Date: Apr 2021
Location: Chiefland, FL
Posts: 862
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You can pick up a set of NPP mufflers for around $300 used. Then you can swap and weld them on any application you like.
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https://www.camaro5.com/forums/showthread.php?t=600181 Mods: Texas Speed 2 inch headers, high flow cats, and X-pipe. Custom mid-pipe, Borla Xr1 mufflers. Torqstorm Supercharger, 3.1" pulley, ZL1 fuel pump. MGW Shifter, Mcleod RST clutch, Tick master cylinder and Tick Billet bushing reinforced slave cylinder. DSS One-piece 3.5" Driveshaft, Metco Driveshaft safety loop, BCRacing Coilovers. BMR Poly Diff bushings, Poly Rear cradle bushings, Sub-frame connectors, Lower control arms, camber arms, and toe links. |
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05-06-2024, 01:36 PM
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#4 |
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Drives: 2002 Camaro SS SOM; 2015 Malibu LTZ Join Date: Dec 2010
Location: Queens, NY
Posts: 4,035
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Got it. I'll take a look out there.
__________________
'02 CAMARO SS SOM; 5.7L LS1/FLS6B
'08 TBSS AWD Black Granite Metallic '15 Malibu LTZ 2LZ Turbo '14 CAMARO ZL1 Blue Ray Metallic |
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05-14-2024, 04:42 AM
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#5 |
 Drives: Swift 2015 Join Date: Jun 2022
Location: Australia
Posts: 1
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Any update?
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