I never had the GY on my car but drove a 1LE with them. I love my MPSS much more. The GY are great when hot but the MPSS can even hang in there when it gets cool out and are great in the rain. MPSS are also not as loud with road noise.
Now if you are tracking the car all the time the GY are probably what to stay with, but many Auto X 1LE guys love the MPSS also.
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