Shock absorbers Bilstein or KONI

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

I have Koni stocks and H&R springs with a 20 mm lift (barely noticeable). I like the way the car became more stable and controlled on gravel and highways. However, springs are considerably stiffer, and with 1-2 passengers suspension feels a bit rigid, but just great when the car is fully loaded.

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.

Bilstein 5100s get over hyped, badly. I have them and I don’t mind them but they aren’t what they get made out to be. Also, their finish is crap and will look terrible in a year.

They used cheap shit quickstruts. Buy new OEM springs and Koni shocks and it will be back to normal.