I sold my white one about 2 years ago, a guy flew in from NY to buy it...I was on the m5board too. I did the calendars for a couple years. Loved the car, and all in all it was reliable.
On the M, I had ram air intake, tune, no cats, magnaflows, short shifter, and I put in the 3.62 ring and pinion from an e46 M instead of the 3.15 stock.
On the 335i, I have DCI, tune, 3in catless dp's, removed 2ndary cats, meth, and n2o.
Here was my M...I do miss her a bit. You'd never know it racked up 130k miles!