Ok, I'm still reading about suspension setup and have a few more questions.
In regards to the rear suspension setup, what is the cheapest adjustable spring perch available for our cars? Are there generic perches available that we can use? I am trying to search it up on eBay or even some speed shops like Speedwaymotors but cannot find the right kind that is similar to IE or TCKline ones.
Now, I keep on reading that the rear needs a 5" spring and that a 6" spring is too long. Now what happens at full droop with a 5" spring? Does it loosen up, and would a helper spring be needed to assure that the spring doesn't come out of its perches? Eibach does make some nice springs with an integrated helper spring to help out what I'm worried about.
For the front suspension, I'm still seeing many people use generic sleeves mounted over where the original perch was cut off. They didn't weld on a new flat perch but used what was left of the original perch. Is this safe practice? __________________ 
2000 M5 -> 1996 318ti -> 1997 328i 
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