Jeff.. LOL @ dinan reputation. Do a search for Dinan and sawzall and M5/Z8 and you will find a lot of horror stories. My E39 M5 was a dinan S2 and removed everything since when I dynoed it, it wasn't making the claimed HP and wasn't even close. Also since it is a flash, it will not be transferable like the JBTT or the Procede. I have Procede 2.02 and love it. It's making over 400hp with a few other mods. 10,000 miles on v1.47 and 3000 miles on V2.02. Loving it. Vishnu has a pretty good reputation and they do good work. I highly recommend them.