Darren, how do you like the everyday sound level of the evosport headers with the dinan exhaust and stock cats? I was thinking of going this route with the AA softwars as well. Do these mods work well together? Also, I have heard a lot of good things about Stett on the boards and am suprised they didn't do a good job.
I have extensive experience with Chad Stett throughout the project life my E60 M5 so far. I can tell you without a doubt it has not been a good experience any step of the way. A number of members on this board have been following my journey with Stett and know the frustration I've been going through for many months. The list is long:
1. Ordered new tires 3 weeks in advance of when I would need them, Chad failed to check to ensure all the tires sizes were correct when delivered and I found out one of the tires was the incorrect size when I picked up the tires and tried to have them installed.
2. Broken plastic cover after Chad removed it and reinstalled it. Yet he failed to call it to my attention.
3. Bad NOS seliniod installation which would cause fuse to blow each time system was armed (not intermittent, every time), yet Chad returned car to me indicating it was working. Obviously he didn't test any of his work.
4. Two very obvious issues on the interior of my car's leather (one on the door and the other on the dash) after Chad had my car for a few days. He was the only person working on the interior of my car.
5. When installing the secondary cats, Chad lost the bolt holding up the exhaust cross bar (it's the small perpendicular metal section just past the secondary cats, yet before the resonator I believe) in his shop and rather than buying a $20 replacement set he just decided to weld the items together
6. Install of incorrect O2 sensor (used front O2 sensor as a rear sensor for some reason and didn't tell me).
7. Bad wiring harness for O2 sensor installation blows fuses. Upon inspection, Chad's soldering points are identified as the culprit.
8. Missing numerous undercarriage bolts and engine compartment bolts. My dealer was in shock to how many of these were missing throughout the car's upper and lower engine area. By the way, Chad is the only person who has worked on this car.
9. Missing side M5 grills after Chad removed and installed them. Later he figured out he had not installed them completely since the backing was still in the car's body frame, but the grills were missing.
I have a list of a few other things as well, but I hope this gives you a decent idea. I need to make a list anyway as I'm going after him for a few items. It cost me $1800 to reverse the damage done by Chad.
Ironically, there a few other DFW M5/M3 owners who have had similar experiences with Chad Stett and it's not pretty. I would be willing to bet if the M3 owners (because that's all that really use him) were to check their cars, I am confident they'll find numerous mistakes and "hack" jobs performed on their cars due to Chad's incompetence and short cuts.
As a one-man-show he is not able to stay current on BMW training and he really has no experience on these E60 M5's. Maybe he's decent on the prior generation M3 cars, but new/late model M5's and the upcoming M3's should stay away.