05-28-2020, 01:16 PM | #57 | |
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What is NPP? At its core, it’s the ability to change the “path” that the exhaust takes through the muffler to directly affect the sound level (and possibly flow restriction level?). NPP exhausts have two outlets on each muffler, one of which ensures the exhaust travels the full length of the muffler while the other allows the exhaust out having traveled only a portion of the way. This second outlet has an electronically controlled valve that is connected into the car’s various control modules so that the driver and the car can jointly control whether or not the second outlet has its valve open or not and to what extent. While any aftermarket exhaust that supports the valve control of NPP can be installed on a car that was not factory equipped with that exhaust, the experience will be starkly different. Cars that do not come from the factory with the NPP exhaust can not be “retrofitted” later to support the integrated valve control. As a result, the valves on an aftermarket e haunt designed for NPP will lack any way to be connected into the control modules of the car to manipulate that valve. While there may be ways to provide some sort of control for that valve, it will be entirely manually operated and will not give the same experience as if it were able to be integrated. |
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05-28-2020, 01:33 PM | #58 |
Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016
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You are correct!
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05-28-2020, 07:00 PM | #59 |
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Has anyone tried the Hooker Blackheart system with the valves? It's kind of unique looking, but pricey. Also why do they say it's for manual cars and not auto cars? I don't see what would prevent it from working on a A8/A10 car.
https://www.phastekperformance.com/2...xhaust-ab1.htm How does Magnaflows sound on these cars? BTW Stainless Works and Kooks make exhausts for these cars. Maybe ARH, but IDK for sure other than LT's. |
05-28-2020, 07:03 PM | #60 | |
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05-28-2020, 07:04 PM | #61 | |
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- Factory dual mode electronic exhaust valve actuators bolts directly without any modifications That means it ONLY works on cars that are factory-equipped with NPP as there is no other way to obtain the "Factory dual mode electronic exhaust valve actuators" they are talking about. |
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05-28-2020, 07:06 PM | #62 |
Drives: '16 Garnet Red 1SS Join Date: Mar 2014
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Magnaflows have always been super droney.
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05-28-2020, 07:07 PM | #63 | |
Drives: '16 Garnet Red 1SS Join Date: Mar 2014
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Quote:
Looking at the exhaust though, it looks like it cuts ahead of the AFM valves, so that's why it's not for auto cars. Although the AFM functionality can just be tuned out.
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05-28-2020, 07:07 PM | #64 | |
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I have seen exhaust specs that state for manual or non-AFM because of what you're referring to. Basically, the car goes into 4cyl mode and there isn't enough back pressure for it operate properly (or is it too much?). Given that this one uses the factory valve controllers, one would THINK that it would just as integrated as the factory exhaust. Unless... They're not maintaining the same level of back pressure no matter what. |
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05-28-2020, 07:26 PM | #65 |
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That makes sense. Good explanation. Good reason to get rid of the AFM and the factory lifters when the warranty is up.
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05-29-2020, 01:37 PM | #66 |
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I'm closing in on a couple of specific cars and have gotten more formal offers from the dealers although the negotiation process isn't completely finished yet.
Both are 2020 6-speed Convertibles. One has NPP and "nothing else" for options and comes with a great discount from the dealership. It's about a 200 mile trip to get it. One has Mag Ride, navigation, and is the exact exterior/interior color combo I want. Dealership discount isn't as large, but it's half the distance away. I'm leaning this direction right now and am going to ask for a little more concession from them and see what happens. Since the more likely car has the standard exhaust, I will drive it for a little bit and then start checking out specific aftermarket options. Are there any "muffler shops" that can provide sounds clips or similar of different exhausts on this exact car? Or, is there some way that might be suggested to be able to hear the various different exhausts on this car before making a purchase and having something installed? |
05-29-2020, 02:03 PM | #67 | |
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05-29-2020, 02:11 PM | #68 | |
Drives: '16 Garnet Red 1SS Join Date: Mar 2014
Location: College Station, TX
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05-29-2020, 02:25 PM | #69 |
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Yeah, there are lots of clips on YT. My thought about them, though, is that they are all recorded under different conditions using different devices. So, it may not always be a good one-to-one comparison unless one person is using the same device to demonstrate different systems. For example: I found one video from a dealer recording the cold-start sounds of a NPP system "open" versus a stock system using two different cars. If I could find similar videos where one person could demo stock and/or NPP against some different aftermarket options, that would be perfect!
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06-08-2020, 06:02 AM | #70 | |
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Sent from my Note 10+ 5G using Tapatalk
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