Quote:
Originally Posted by Hagels316
WRONG- Grounding the valves DOES prevent a CEL. I upgraded to the Stainless works exhaust with AFM delete option (which provides AFM grounds in place of new valves). This is one of the many options you can select when purchasing a SW exhaust (either include AFM valves or delete them with included grounds).
The SW exhaust with AFM delete does not have AFM valves, but allows the factory AFM wiring to connect and be grounded to the exhaust via "dummy valves" thus fooling the car into thinking the valves are connected and working when they really are not. If you do not have a way to connect the AFM to something, it will throw a CEL. It's similar to the AFM delete module wiring that you can purchase.
If you don't believe what I am saying, call SW, they will explain it to you. My car is also proof that grounding does work.
Some of the catback exhausts do not include a grounding option for A8 cars, which forces you into purchasing a setup with new AFM valves making it more expensive. Or using the AFM delete harness from EFI as another option.
I should probably add that whether you have AFM grounds ("dummy valves") or not, you will still need to tune out AFM at the ECM level to prevent the engine from going into V4 mode.
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Unless they changed something in the past few months I'm calling BULL SHIT.. I was one of first ones to do a AFM delete cat back from SW and had a CL from day one. They didn't have a clue as to why "plug them in and bolt them to the dummy mount" was all I got in response from them.
Maybe they have removed the butter fly and put a spring set up with tension on the "delete" mount.. that's the ONLY way it would work without getting a CEL