Discussion: Eibach EVS Valve Springs

[808MP5]

Hello my fellow Mazda enthusiasts.
I wanted to know a little about this product.
http://www.corksport.com/eibach-evs-spring-kit-fs-series-engine.html

Please discuss any (detailed)reviews, specs, application(when and why), etc etc...
Other possible discussions related to this subject such as retainers, valves, or the entire valvetrain is encouraged.

This should help with others wanting to know also.

 

[CR3 Motorsports]

Why not the Supertech ones? I believe I can get those.

 

[808MP5]

^Pm'd
I think the main concern for me is why would I or anyone else need an upgrade.

I've seen the supertech ones at cross over. For not much more you can get the springs seals and titanium(good or bad?) retainers vs. the EVS springs. I'm very ignorant about anything valvetrain related. Just wanted to get a little info on why would anyone would need this upgrade.

All sites that sell such products are pretty vague about descriptions. All they pretty much say is it will help. But searching the web there's a lot of mixed discussion on this subject.