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I have the same car as yours. I went with M5 Front Sway Bar and 650XI Rear Sway bar. I noticed an improvement by just doing that.
Can't speak on retrofit you are asking but I bet it involved a lot of piping to get it in.
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2013, 535 XDrive, 112k miles
1997, 328is, 335k miles - Retired
1998, ML320, 200k miles - Sold
2018, Q5, 100 miles
2005, XC70 AWD, 160k miles
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