I think that the risk of modifying an E70 diesel to remove emissions controls is greater than the potential benefits, largely due to the integrated nature of the controls. These aren't like an early Powerstroke or Cummins 5.9, where a straight pipe solved the DPF replacement cost problem.

I do agree that as this generation of diesels ages, owners are going to be faced with costs that they likely didn't expect. New diesel owners traditionally think about not requiring tune-ups, no spark plugs, etc, and think that their engines will therefore have a lower cost to operate than a comparable gasoline engine. Since there is no longer any significant tune-up cost on a BMW gasoline engine, I think those costs are a wash. What does cost money is complexity, and BMW poured a lot of it into the new clean diesels to make them clean. Those parts will be expensive post-warranty.

I also agree that it makes no sense to be planning this now for a US market diesel under a four year warranty. Tampering with it just means agreeing to pay any emission system repair costs that BMW would have otherwise paid under warranty. This tangent started with the suggestion that GoVol's mileage could be improved by removing the DPF and reprogramming the DDE.

__________________
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