If so how much?
I want to mount a 3rd front sensor using the rear shifter port.

 

Just as an FYI to anyone else putting a 3rd front shifter/sensor on for the front of the car and plugging it into the rear shifter port on the control module of the 9500ci:

Escort is now charging $200 for a single shifter (just one, no bracket etc). I informed them how crazy that was, and the lady on the phone understood my point but Escort management decided what it decided.

So for $450, I purchased an whole kit, a ZR-4, which comes with
(2) front shifters
(1) rear shifter
Remote mute button
Interface Module
mounts
control module.

If the 2 front modules are $400, then I'm getting the rear and mounts and all the rest of the kit for $50.

 

I have the 9500 ci, why do you think you need 3 front shifters?

 

Some 9500ci owners have done some tests, and determined that for LIDAR aimed at the front - 3 front facing sensors/shifters was significantly more effective than just the 2 that the 9500/ZR4 solution comes with.

They took the REAR sensor/shifter port and routed a 3rd front sensor to that port. Of the 3 front sensors, one under the license plate, and one in the air intake on the side most likely to get hit by LIDAR -where ever the police ar parked - median or right shoulder). Then route the 3rd shifter from the other side intake to the rear port.

In their testing, that solution was much more effective at temporarily shifting the LIDAR return to the gun from the front than the 2 shifter solution. This is based on the process by which the LIDAR operator aims first at the near side headlight, if no reading then the front plate, and then if no reading the far side headlight. So putting the two front shifters on the first targets to be lased made the system more effective. Not having a shifter on/below the front plate made it less effective. (putting the back side shifter on the least likely target side reduces the effect of that shifter being driven by a different circuit that could be out of sync with the center/opposite side)

Given that being lased from the rear of the car is a much less likely scenario, giving up the marginal rear laser protection in favor of a stronger front laser protection seems like a good trade off.

If it turns out to not work in my case, I can always install and route the rear shifter.

One thing I'm going to do is do some electrical investigation on the patch box of the 9500ci to see if the front ports are really driven by separate amplifiers, or if the two ports are actually electrically connected. If, by chance, they are electrically connected, (ie one amp just drives both front shifters) then I'll look at the output and see if I put a signal splitter on one, I can run 3 front shifters from the 2 ports and still get enough output power. That would let me run 3 front shifters emitting a synchronous signal on all 3, and let me use the rear shifter.

 

Do you have those tests? I would like to read more. Thanks.