Archangel06

Finally found the time to retrofit my 08 base with the OEM NPP exhaust setup. I didn't want to reinvent the wheel so you can follow the “Z06 Rear Muffler and Butterfly Valve Vacuum Assembly Installation” writeup another member here wrote up in pdf format attached to install the dual mode mufflers, OEM vacuum solenoid, reservoir and all necessary vacuum tubing to valve actuators. (I'll try to find the link)

Electrical:
You’ll need the NPP Exhaust Tail Pipe Flow Control module GM p/n: 15909509 and associatd harness(s) I used OEM harness(s) for the module and solenoid that were sourced from a wrecked vehicle.
You can purchase both connectors and pins from Mouser Electronics (module harness p/n: OEM 173850-1/Mouser p/n: 571-1738501) (I will update the post with all part #’s later today)) Note: The and Exhaust System Vacuum Control Solenoid harnesses are connected by a TN/w wire.

Getting to the data:
If you have a service manual refer to the “Data Communications” section 11-XXX to get an understanding how this all works, but for this writeup the Flow Control module connects it’s TN (tan) wire to circuit 5072/terminal “M” on the SP208 splice pack which is located clipped to the passenger side console near the stock amplifier. It is likely that there will not be a wire there so you will need to do one of 2 things: Source a splice pack from another vehicle, or purchase the wire connector (which I did) and install it into the splice pack. I installed the module in the passenger floor well (see below




Power/Ground:
I used an “add a circuit” to supply power to the Exhaust Tail Pipe Flow Control’s R/WH wire and installed it in the OEM “ExhMdl”circuit location in the fuse box (passenger floor well) As for ground, I use the ground that I had previously installed for my backup camera and Valentine One ground.
I ran dual 18ga wire run from the Vacuum Control Solenoid harness to the TN/W wire connected to the Flow Control module and grounded it in the same location as the Module itself.

The moment(s) of truth:
Started the car and it instantly growled and then purred…took in for a spin and jumped on it @ about 40% throttle and right @3500rpm she screamed louder. Switched it into “Competition” mode and executed the same test…….40% throttle and right on cue @ 3000rpm she stared screaming again!

Success! Plug and play OEM NPP that functions as GM intended w/no aftermarket sytems needed. I am debating adding a switch to turn it on/off at will, but I love the way it works/sounds as is.

Note: I would recommend https://aescorvetteparts.com/ for all OEM parts, they have plenty of modules in stock, and some of the OEM vacuum items at reasonable prices w/free shipping (I am NOT affiliated)

Supplemental:

Class 2 Data - 1

Class 2 Data - 2

Class 2 Data Communication

Control Valve Solenoid

Control Valve Module Pinout - 1

Control Valve Module Pinout - 2


SP208 Location - 1

SP208 Location - 2

SP208 Splice Pack

Module w/Connectors

NPP Control Module

Dropspeed

Nice Job! Glad to see the mufflers and X-Pipe worked out for you.

-Matt

joliett

My car is base 08, F55.
I have the NPP mufflers, and I am researching how to use the original NPP controller. I knew this would work....and you proved it!!!!
This write up is PERFECT!! Thank you so much....
The part numbers for the connectors is outta sight!

Anything to add would be appreciated! Thank you, Archangel06!

Archangel06

2 or so months and it'sstill working as intended. I need to find the time to install all of the owm hard vacuum lines for the complete factory install.

I do need to get back to this and update it with connector and pin part #'s.

PCMusicGuy

Does this work the same for 05-07 cars where NPP was never an option?

Archangel06

Yes, it should. All you need to do is gather the parts and tap into the serial 2 data bus

joliett

I researched the connectors to the serial 2 data bus. These are the male connectors I bought. Not sure on the housing.
I may just inset just the male connector.

https://www.delcity.net/productsearc...&it=&x=10&y=12

I bought the male pin...GT 150 Series Terminals - Male...

Archangel06

If you are going to use the splice pack, you'll need the female as well.

rsb213

Awesome write up. All credit goes to archangel on this, but the connector that plugs into the control module is part number 12085208, which sells for $20-40, but currently as of typing this out amazon is selling AcDelco PT2763 for $5, which is the same thing with the pigtail already attached. In case someone is looking at this far in the future, this website shows all the interchange models for this connector. I'm going to use this to control my boost a pump for an N/A application. Since I cant use a boost switch, I was considering running a nitrous controller but I figured this would do an even better job for less. I'll do a write up once I get everything in but as far as I know no one has ever done this. Thanks again to Archangel for the time spent writing this up but also helping me find the part number for the connector.

JDsC6

Thank you for this post: I am also looking at this solution, can you tell me more about circuit 5072/terminal “M” on the SP208 splice pack the tan wire. I trying to see if this circuit is on the 2005 C6. Thank you

rsb213

If your car didnt come with NPP, it won't be there. Just need a regular old wire with a pin on the end and you can add it.

Archangel06

This.

Edited to add "supplemental" information to complete the project.

JDsC6

Has anyone else tried this install? thanks