170 total seems very fair price to me.

Let me know how it goes with your installation (and please share your DYI pics if possible). If it's fairly straight forward, I will try to do same thing. Thanks!!!!!!!!!!!!!!

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X5M
PAST: 08 E90 M3 | 08 E92 335i | 03.5 E46 M3 | 99 E36 M3