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I agree with Mark on the CTIS. I have had many A2s, and I have never had one that had working CTIS...at least that worked for very long. That includes the couple where I replaced every CTIS part. You want to talk about an investment in parts?!?! The CTIS on my M928A2 works to some degree...

Sorry for the delay in responding. The low end power difference is noticeable. However, the differences would vary by truck. For example, I have two A2s right now. One runs stronger than the other, but neither has as much power from a dead stop as my A1. I have an M927A1 (with the NHC250)...

The M923 is probably the better buy if all things are considered. The A2s generally bring more money. WHile I like the quiet motor, the NHC250 has much more low end torque. Plus, while many parts are consistent across the various series, some parts are A2-specific (translation, hard to find...