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I have one on my excursion. Put it on when we did the head gaskets, turbo and ported intake. Cant say weather it does anything or not. one thing is it eliminated the butterfly thing that has to do with the egr. Engine light is always on now cause of that. No one can get it to bypass that code.
I just pulled the butterfly. left the shaft in place and cleaned up the elbow a little with a die grinder. Don't know if made a difference on power but made me feel better and.
If you have the butterfly and wanted to use the new horn then you could
just zip tie it to the EGR valve or something else in the valley after you
have remove the valve so that it does not get stuck on something and throw
a code for the getting stuck. You might be able to even remove the motor and sensor from the spaces assembly and just zip tie that in place do there is less junk.