If you are paying $600 for $900 coilovers, you are probably buying K-Sport coilovers or something along those lines. While they are a step up from stock, the valving on the damper is not the greatest. All of the lower end coilovers are almost exactly the same. They may have different features, but the core of the coilover is the same.

There aren't a whole lot of companies that actually make dampers. KYB, Koni, Tokico, Ohlins, etc. K-sport and the like use the same damper made by the same company.

If you are going to shell out the money for a good set of coilovers, honestly, be prepared to spend about $1800. Get some JIC Magic FTL-A2s or some KW Type IIIs if you are looking for a really nice setup.

With whatever coilover setup you go with, be prepared to spend a bit of money on alignments as you adjust camber, castor, and toe to get the desired ride/response when tuning your setup.

I'll answer your other questions later.

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