My guess would be some ridiculous pot hole unless your frame is rotting and decided to bend. (unlikely)
Edit: 20 mm spacers will not throw off your alignment. In fact I would say that anyone adding just spacers probably doesn't need an alignment.
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2010 370Z 40 Anniv., 6 MT | Fast Intentions | Swift Springs | SPC | Z1Motorsports | JWM | Redline Oils | 35% Window Tint
2015 Mazda6 | 370ZChicago: Chicago Area Cars & Coffee
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