congrats! The 550 is a beast in sheep's clothing.
Never heard of HK springs. The most popular springs on this forum with nothing but raving reviews are the ACS springs. H&R give you the lowest drop but harsher ride compared to ACS.
Eisenmann Race should set you back about 2800ish. Excellent choice
You may want to consider a Dinan flash for the 550 if you want another 100HP to play with and totally forget about your old M3 lol
Alan
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