If it is a true FX4 (later models), it already had some of the best shock absorbers to begin with - Bilstein.
Reviews of Bilstein shock absorbers
2005 votes
The Bilsteins put somewhat of a level on it, and this may be a n00b question, but curious if they can be modified to add a couple inch lift to the truck? It could use it with the bigger tires.
On my 2007 GTI when my stock shocks went I paired the Eibach springs I had used with the stock shocks with a set of Bilstein B6's and it was literally perfection.
How do those ride compared to stock? I just got bilstein 6112s put on mine with SPC uppers and it rides way better than stock even around town.
belstein 4600's are a great stock replacement, they came factory on the fx4 level 2's.
Bilstein B14 (non-adjustable) or Bilstein B16 (damping adjustable, rebound + compression together IIRC) are also decent choices, and I believe there are versions that will fit both FWD and AWD GSWs. My Alltrack on B14s appears below. I have them set within 1/2\" of the top of their adjustment because the tires are 245s and I don't want too much rubbing. The can go at least 1.25\" lower.
So far it rides really smooth, much better than the OEM suspension that has most likely been.
Bilstein B4s are cheaper but fail significantly faster.
The Bilstein B8's they have should be solid and properly valaved to the OE WRX spring rates. Bilstein makes good stuff.
Next Up Bilstein 5100 shocks (In the mail) Bilstein Steering Damper (In the mail)
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