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Bilstein strut vs OEM Strut

  • 2006
  • Boxster S
90 000
San Jose, 

My rear right strut is bleeding and thus need replacing. I am a little confused, however, as to the difference between OEM strut and the Bilstein B4 and B6 strut. The OEM strut seems to be going at a much higher price then both B4 and B6 at reputable vendors. But research seems to show that B4 is basically exactly the same as OEM which is also made by Bilstein and B6 is an upgrade. So would it be a no brainer to go for the B4 and a good idea to consider B6 as an upgrade? Would it be also true that if going for B4 then only the rear two since they are the same as OEM and if going for B6 all four needs to be replaced to keep the balance and all the other part of the suspension like spring don't need to be changed in both cases?

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