What's your main use of the car? I find that I want a lot of things, but most are impractical when they're only used of 0.05% of the driving I'm doing with the car. It's hard to justify a lot of race/track-related things in a car that's primarily daily driven.
But...welding the diff is an easy one. Don't.
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2013 Cadillac V-Wagon, RIP Z
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