China quality all depends on how much money is being spent on the facility, research and development, and quality control. Most companies don't have the money or resources to invest as much as needed into those 3 things which is why alot of the parts come out crappy. But if your say Apple then you have a ton of money to throw at those 3 factors and you make good products.
As for sideskirts either replicate the BMW Performance ones at a good price or come up with your own with a better design.
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