Dave we put H&R springs in my dads E46 m3 when a rear coil broke and it lowered it nicely. There is a issue with the E46 when lowered where there is notably more understeer - turner motorsport makes an adjustable rear control arm to correct the camber issues that wear these tires - the tire wear is just the cost you pay to have a car that drives like these do but you know that. Thats my two cents.
If you want to lower it with coils I would also suggest the Eibach springs with Bilstein Sports as they are much more street friendly and do not lower it as aggressively much but if you want a full kit I would do coil overs so you can adjust it how you would like and have upgraded shocks/struts also.
Even more so because you track it
Mike
88 Volvo 240 4NBRICK
83 Volvo 240 Turbo hoping for est 250 275HP
71 Datsun 521 1500 pickup/ute... Little Project
"Good Drivers have dead flys on their side windows"
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