The aftermarket autogasmic behemoth that is SEMA starts tomorrow. Good a time as any to ask the question again — what's the worst aftermarket auto add-on?

In our minds — the worst add-on is any aftermarket part sold as a "performance" booster when there's not a lick of performance benefit provided by it. Put anything chrome, plastic and fake on a hood or side quarter panel and we're NOT going to like it. At all. But, recently we found these 3A Racing "performance" mesh fabric seat covers. We're not only 100% sure they won't make your car go faster, we're pretty sure the added weight will actually decrease performance. What we also know is we don't want them.

You have something worse? Give us specifics and pictures in the comments below.

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