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I've helped a half-dozen people via PM set up a simple switch tied to 41/42 that opens and closes the valves at will. You keep the ESM set to 'mode', and simply switch to your liking.
I tried several variations of wireless relays (essentially making it a similar mod to the M2W), never with any success - there is some EMI that just plays hell in these cars, and I can't figure out where it's coming from. /shrug
Would be nice for a company to just sell a kit - I can supply a parts list to any vendor that would like to do this. I don't have the time to make them, but it's a simple kit. I even have a nice switch position on an inexpensive panel.
Isn't the C6 M2W just a remote fuse relay? What is unique about the C7 that the C6 version wouldn't work? It's been a few years since I had a C6 w/M2W so my memory on how it functioned is a little fuzzy.
Only very slight differences - biggest difference being the fuse size. If I remember correctly there was a slight difference in the circuit stated by someone either on or close to the M2W team.
I'm just using a simple on-off physical voltage switch with an in-line.
Hmm.. That's disappointing. Would like the louder exhaust but able to turn off when needed. Also disappointed that the exhaust closes at about 35mph in sport mode on the C7's.