Are downpipes even available for the 50i?
Given that the turbochargers are mounted in the valley, that the heads have a reverse flow with intake on the outside and exhaust in the centre of the valley, the downpipes wouldn't be anything like the 48i downpipes, or any other traditional V8 for that matter.
I thought it was a trick question to see who was paying attention 
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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