^ Thanks for the input, I'm sure it will help lots of people. I'm still going to maintain the idea that it's just not worth it for the time/money spent. I bought my H&R Race springs for $140 and my car on those and blown non-sport shocks was absolutely on rails. I'm all about using OEM parts when possible, but I'm still not convinced that the M3 suspension is even an upgrade for stock non-sport non-M cars.
WTB: Complete e46 M3 rear end