I have an AT 335xi w/ AFE dual cone intake, stock exhaust w/ cat delete, and SSTT. The SSTT is the modest of tunes and my launch is still crazy. I can't wait to up my tune and add a few more things.
My car was stock for one week before I modded it and I didn't find any SRT's that wanted to go. But I have gone up against a lot of them with my current setup and pulled on all of them including a Jeep off the line. Never raced any above 130 MPH and didn't know any of the guys driving them so couldn't tell you if they were modded or not.
Only one SRT beat me... a friend's 10 second neon