There is no technical reason for not making the emissions regulations only economical. It simply does not makes sense with the market and alliances being formed.
2006 Excursion 39L - Spartan 350hp Cat
2008 GMC Acadia
2001 Chevy HD lifted 4x4
1995 HD Badboy
Not sure if this is still true, but Cummins did not make the grade between 2004-07 on it's larger engines. Because of the credits from all of the 5.9 engines- different standards- they were able to sell non-conforming engines. We have passed the point of this making economic sense and with the even more ridiculous standards for 2010 Cat is saying they have had enough.
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