Quote:
Originally Posted by Grandpawmoses
Something else that effects the sound is the AFM valves ahead of the NPP. Their main function is to change the exhaust back pressure when you go into V4 operation. You can't/shouldn't defeat these or you'll throw a code.
You can pull the NPP fuse or control the NPP from the Infotainment system setting to stay open.
If you want that "start up" growl all the time, you can get a Range AFM device to override the V4 mode all the time. Of course you can choose to keep it in "Sport" or "Track" too but I kind of like the "Touring" mode for daily driving.
http://www.rangetechnology.com/pages/v8 |
NPP is worth every penny...
You will always have the startup growl as the V4 mode only kicks in when cruising. You do not need the Range AFM for the start up. Also only the A8 has the AFM on the SS models. The M6 models the AFM is non-functional.
__________________
2019 ZL-1 Acquired 4/23/21 at 6300 miles. Riverside Blue, A10, PDR. Traded in 2017 2SS with 6M and 32k miles. Continental Extreme Contact Sports. Now has 10,000 miles...
2012 Yukon XL Denali w/ 6.2 AWD