I thought with the roof down the ultrasonics would still pick up. As they rely on sound from movement. Whereas the microwave pick up movement instead of sound. I also changed the sensitivity to pick up just outside the window. I know this is ur area of work so if i am wrong i will change my choice of sensors lol. Just thats wat i was told would be better In my sonata. but im yet to install a new alarm into my wrx so if u could clear that up that would be great.

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I had the loudest stereo in a wrx in WA. Until i hit a wall.