My 2010 XT has almost 100K miles on it, and I can tell the suspension has lost some of it's effectiveness. I've researched different strut brands and have decided that it's worth the money (to me at least) to go with Bilsteins over the KYBs. Does anyone have experience with the Bilstein struts? Also, what is the ride like with the B6 (performance series) versus the B4 (OEM replacement)? The Summit Racing near me has both series. I'd appreciate any advice.