So, how many have had multiple fill ups of DEF yet?
Sadly from my findings and other it seems like a little over a gallon per ~1000 miles. What's your findings?
Yea I agree with CJ, I don't foresee any major issues with that. The technology has been around for a long time... and as he mentioned, all shifts now are some forum of electronic shifting and not a true gearbox.
I found 3M's article http://solutions.3m.com/wps/portal/3M/en_US/3M-Automotive/Aftermarket/Our-Brands/Scotchgard-Pro-Series/
I would google in your area and look for good reviews! It's the only way to go.
Generally Cat-Back exhaust change the sound so slightly you can't hardly tell. When you remove the DPF and other big restrictions is where it becomes noticeably loud.