Jayson-
Here's the info on the Technik swaybars. They are also made by Eibach and are 28mm/18mm. I bought mine from Sam at Rennsport in Southern Calif. Phone 310/235-2015. GREAT ADVICE and SERVICE!
These swaybars are one of the best mods for the price...under $400 but plan on paying about 3 hrs. labor if you don't install yourself. The front install is quite difficult and an experience mechanic, who isn't trying to rip you off, will take at least 2.5 hrs just for the front.
They work great! They greatly reduce body roll and when you turn-in to begin a corner, the car tracks with much more response. Went on a drive this past weekend on nearby canyon roads with two buddies--one driving a 97 Porsche twin turbo (400 hp)and another driving a 2000 Lotus Esprit V8 twin turbo (400 hp). They were amazed at how my M5 handled the turns...from high speed sweeping ones at 100 mph to tight low speed at 25 mph. They could not keep up with me...granted I've had more racetrack experience than they have had.
Also had them installed with Beastpower's rear SB brackets and I had the high-performance shop say, "they look like they could hold up a bridge".

I feel much more confident when taking 100 mph turns!!!
Cheers, Brad