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I'm very interested in this mod.
I have noticed that there is a very slight sweet smell to the exhaust, as stock. It reminds me of my father's 05 cummins, which has a catalyzer, but no urea system. That has a very sweet smelling exhaust.
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2009 xDrive35D
Comfort seats, Tech, Premium, Cold Weather, Sport w/ Adaptive Drive, Extended Nappa Leather
Deleted & Stg 2+ Tune for over 115k miles
227k on the clock
Being replaced by a 2016 X5d
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