everyone i've known who got underbodies has liked them for several months, to a year (give or take) and they never used them, or decided its lame.
personally, i wouldn't impulse buy them... wait until you have more done to your car (if you don't have much) and put the money toward something else.... that can be used much more often.
for the people who have them... how often do you actually have them on?
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