While this threads still fresh and ppl coming in reading it. I have a few noob-qs on spring/suspension kits as well.
1. What happens to the OEM rear airsuspension? Are there springs on them too? Does it matter what type of spring you putting on them?

2. With the kits you get, is it simply replace the OEM springs with the ones you brought? eg. H&R, bilisten, eibach...etc etc?

3. For cars without the sports package (eg. my car), will handling be improved EVEN BETTER than that the OEM spring? or theres much more needed be done? (eg. new strut bars)?

4. Does installation process differ, on SP/standard?

Big thanx to everyone! Read/Answering to my NOOB QS Cheers