...And there's a nice little write up in the FAQ. Save yourself the money and DIY... It's easy, and takes maybe an hour, if you're slow.

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'00 B5 1.8T QM VAG-COM in Hyattsville, MD!

Since my car is under construction:
your -In possession of 'you.'
you're - Contraction of 'you are.'
ur - Contraction for 'I'm a giddy middle-school girl who draws 1cm diameter circles over all my i's.'
there - Gives location. I.e. 'that car over there.'
their - Plural possessive. I.e. 'their cars are over there.'
they're - Contraction for 'they are.' I.e. 'they're a bunch of internet morons who failed English in the 3rd grade.'