[Yzandrl]

I was curious about this damper with the changes in the line. I have to rebuild my 4100s and fix some parts damaged by the installer. I have the option to rebuild/upgrade. What's this hype? I posted the press release for reference. I don't endorse, or support but I wanted to hear a little more about it.

What makes this digressive piston method so much better? I am to understand that this allows a relaxed family car setup (depending on other factors of course) at low speeds and a fast responsive race ready at the high end.

Thoughts? Any other products that it is similar to in technology?

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The new design builds on the success with the AST 4100 series damper and the recent wins in GRAND-AM Continental Tire Sports Car Challenge, including new technology developed specifically for GRAND-AM racing teams.

DDP Technology Piston

Our latest digressive piston developed for GRAND-AM gives drivers and race engineers the best of both worlds. Drivers love the low speed damping response and body control, while race engineers love the “blow off” at high shaft velocities. When the rebound adjustment is soft, the damper curve looks similar to an OEM street shock profile. When the rebound adjustment is hard, the damper curve looks like a race shock!

This “Jekyll and Hyde” personality is exactly what AST 4000 Series customers want: soft street ride and race car track performance in ONE shock – all with the turn of a knob!
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[nikitino25]

Where can you even get these for the e9x? Harold with HPA was trying to get 5 orders together to have them made I thought for the e9x but I don't think it ever came together....

[sutter2k]

I was interested in these. The 4100 series has dried up. For 4150 Vorslag told me eta fall of 2013 for e90, but could not guarantee arrival. I wound up buying TCK SA (not installed yet).

Matt

[neoduffer]

OP - Did you decide on the upgrade and how much more was it going to cost over the repair/rebuild?