Yes, you can use OEM springs with the Bilstein B6. I have them on my MS3 and the ride feels much more planted compared to the stock shocks / struts.
For shocks themselves I went with Bilstein B4, also at 120kish and also for no reason as my stock shocks were fine, but they are also problem free at 155k
Having done my own suspension install a couple years back switching from stock to Bilstein B8s / Nuespeed springs, while the cost does seem high, the fronts are a royal pain in the ass to DIY so there is a part of me that thinks it's worth it to have someone tackle the front for their expertise/tools and speed to complete w/o a million swear words from your end.
I like my Bilstein 5100 on the back on my 2012 Sequoia sr5 4x4. 4600 are good as well. Can't go wrong with either. I like the Bilstein, I have not tried the others though.
if you're going this route, **** the stock struts/shocks, the Alltrack specific b6 is similar parts price and so much better
I also noticed that the Bilstein B6 are not much more than the B4 on Rock Auto, given that you are driving a Boxster, handling is probably a top priority, why not use the chance to also get an upgrade?
Despite the fact that I had to pour quite a bit of $ into bringing ours up to an OK state (Bilstein shocks, new rims, brakes, battery and alternator) it always puts a smile on my face and makes me want to drive it more.
I believe that the only solution is 2 Blistein B6, about 400USD each
4600s at stock height was the best my jeep every drove. Moved to 3” lift with 5100s. Honestly considering going back to stock on my next XJ
I have 5100’s on my XJ & they are definitely an improvement. Stiffer on road & great off-road, definitely an upgrade over stock or rough country I previously had.
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