Might be less effective on the Mav than on the S-10, but is it effective on the Mav. I have not done a accurate comparison, I just figured "it can't hurt" so why not? If I need to go off road, it is a quick, four bolt removal.
Replace to door speakers, made a world of difference in the sound, but I also added sound deadening material, which also helped. I, like you keep cars for 20+ years, so why not get it as quiet as I could and the sound quality better?