I got the unit Monday AM. Stopped by an automotive store and got a MANUAL 10 amp charger (About $65).
Followed instructions to turn off anything/everything in the car possible. Hooked the charger to the battery in the trunk. Carefully closed the trunk lid so as to turn off the courtesy light.
Plugged in the injector, then turned the ignition on. (Didn't start the car)
Green light on the SI. Pushed the UPGRADE button and waited about 5 min. for the process to finish.
When finished. Turned off the ignition. Removed injector. Removed Battery charger.
Waited a few minutes. Then hopped into the car for some residential terrorism.
Gears 1, 2, 3 and 4 pulled really crazy!! (ASC on by the way)
NOW UPDATE TO THIS AM, on the way to work-
Some decent expressway straightaways (ASC off)
1st gear- ZOOM!
3rd Gear-lotsa pull to 80mph
4th still has guts
5th Ok, not bad
Overall pretty darn good bang for the buck. My M3 is a 96-Luxo Pkg.
My mod list is pretty short (so the effects I felt from just the SI upgrade should be pretty universal for the rest of you guys who haven't dived too deep into your wallets yet.)
RS Short Shifter
German Strut Tower Brace (CNC Machined alum.)
and the Shark Injector
My conservative guesstimate on these mods is maybe max 268 horsepower vs the 240 stock. (adjusted crank hp based on JC's input of a dyno 16-22 horsepower gain with CAI/Software).
I think spending $750 for net dyno 18-20hp is a darn bargain for plain bolt-in performance. On the Japan import side you'd get what headers and exhuast for about that much and you'd be lucky to get 10hp on the dyno.
Well that's about it for motor mods. I know really light weight compared to you guys. But I'm kind of a handling junkie.
My next adventure will be to redo the suspension (at my wife protests). And after that...concentrate on raising some kids. :]