This past week we had a 2018 Ford Mustang GT (S550 chassis) come in for testing. This particular one has the Performance Package. This package looks to include “heavy-duty” front springs and a thicker rear sway bar. Our guess is that the factory shock absorbers and rear springs have also changed from earlier S550’s Performance Package, with the shocks being a tad big more aggressive in valving, and so far we can say that we feel these differences.

You can say it is a much sportier ride now. However, for some of us older fellows at TEIN USA, it was a bit too uncomfortable, whether it was street or highway driving. Personally I don’t really like how overly sensitive the steering was. Felt like I could accidentally loose control should my reflexes overreact. It just felt very twitchy and unstable.

Anyway, we wanted to test our upcoming STREET BASIS Z coilovers for this vehicle. BUT, it was also an opportunity to test our ENDURAPRO shock absorbers on this car, and it was definitely an improvement from our point of view!

As mentioned, the new GT Performance Package offers factory upgraded suspension. It was a far cry from how the first S550 GT we tested felt (when we were developing our FLEX Z coilover kit).

With the ENDURAPRO shock absorbers, ride quality was much more bearable for a daily drive. Much of the harshness we feel from the factory suspension is gone (however we can feel a difference with the stiffer front spring). Turn-in hasn’t changed dramatically, which we can possibly attribute to both the front springs and the larger rear sway bar.

How this compares to earlier S550 GT suspension is quite different, however. Again, with the current Performance Package suspension being more aggressive, the ENDURAPRO shock absorbers now make the car feel more compliant (not soft, not boaty, just better comfort). On an earlier S550 much of the sportiness is still there. But in both cases, the included Hydraulic Bump Stopper of our ENDURAPRO shock absorbers adds a much smoother ride quality under heavy loading. Over very large bumps, like expansion joints or overpasses on a freeway, this Hydraulic Bump Stopper really helps suppress upward jolts and smooths out the rebound. Given that the Mustang has relatively short suspension stroke, this pays huge dividends to providing comfort!

ENDURAPRO shock absorbers for the S550 Mustang are in stock and ready to ship!

Part numbers:
Front- VSGC0-A1MS2-L (left side)
VSGC0-A1MS2-R (right side)
Rear- VSGC1-A1MS2

Also available in ENDURAPRO PLUS (16-click damping adjustable)!

Front- VSGC0-B1MS2-L (left side)
VSGC0-B1MS2-R (right side)
Rear- VSGC1-B1MS2