My local indi mechanic in Stoneham (interstate fuel) just installed H&R stings on my 435 GC for $400. The owner Tiago has done work on quite a few of my cars over the past 5 years. He is extremely careful (uses wheel saver sockets) and very thorough.
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2013 e92 M3
2011 X5 35d
2018 F80 M3 ZCP
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