Hello, I'm Justin and I own a 2003 540i/6 M-tech... its not an M5 but I like it a lot. I have always loved the E39 and finally found a clean one and fell in love with it. I could have bought an M5 but I liked the slightly lower price tag, slightly lower insurance, slightly lower parts costs, and the better mileage the M62 offers over the S62 under most conditions... the car is not my daily driver (I have a company truck) but it does get used for some road trips and on the weekends.
I have added some M5 parts though. I picked up a healthy LSD diff (break-away torque measured at 72 ft/lbs!) and M5 rear sway, along with some other BMW and aftermarket bits. It was stupid that BMW didnt offer an LSD as at least an option on the 540i sport. Completely transformed the car.
Next on the list is coilovers... likely plain Bilstein PSS, I have read mixed reviews but it seems the people who complain about them are simply too low and are on the bump-stops and/or getting coil-bind. I am also considering BC but I honestly don't care to adjust anything, I'm more of a set-it and forget it type of guy.
Eventually I will want more horsepower and won't care about mileage much.... I'm kind of in the air on whether I should build an N/A M62 (increased displacement, M60 intake, 4.6 cams, evolve headers), just go with a supercharger, or look into an S62 swap.
Anyway, here she is:
I have had quite a few VAG products (B5 A4, MKII GTI, 200q wagon, Coupe Quattro 20vT) an E34 535i, a '79 Monte carlo that I built a 355 for and drag raced with, and a few SUV's. We are likely picking up an E46 330Cic for the g/f possibly by this weekend.
Anyway... hope you guys don't mind if I hang out here from time to time, I like it much better than most the other BMW forums.