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I know that a lot of user do, in fact, ignore Revit's calculations. I suggest that you try asking this question over at the forums on AUGI.com, as there are more experienced and knowledgeable mechanical users, there.
Corey D. 
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I understand that, and you should indeed get what you paid for. However, these forums are peer supported and almost entirely comprised of end users freely helping other end users, with the periodic visit from Autodesk support personnel. You could take advantage of your Subscription and open a Support Case; this can be done done from the Subscription Center on Autodesk's main website.
Personally, my knowledge lies more with the electrical discipline and with general platform-based issues, which is why I haven't been much help here. Though, I do want you to find any assistance that is needed, hence my suggestion to ask on AUGI where there is a higher chance (I believe) of getting an answer to this question from an expert in this field.
Additionally, I would never suggest that you ignore the problems, flaws, and errors with this (or any other) Autodesk software. Voice your issues! I guarantee that you're not alone. Also, below is a feedback link which I encourage the use of in addition to opening a Support Case.
Autodesk Product Support
The following link is setup for you to submit feature requests, or feedback, directly to our Development group:
http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=1109794
Corey D.
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⁞|⁞ Please use.Accept as Solution and Give Kudos as appropriate to further enhance these forums. Thank you!
──────────────────────────────────────────────────────────────────────
⁞|⁞ Please use
.Accept as Solution and Give Kudos as appropriate to further enhance these forums. Thank you!
Hello Vitaliy5151--
There are many methods by which one can compute the friction factor, which affects the pressure drop calculation… depending on which is used will affect how similar the result is to another product that may use a different method. There are 16 methods documented in a 2011 FME Transactions article, which, amongst other customer feedback, led us to enhancing Revit 2014 to enable customers and 3rd parties to add additional methods to Revit. Jeremy' Tammik's blog provides insight into how you might do this. So, if so inclined, you could change how 2014 works to suit your needs to get results aligned with your expectations.
Revit 2015 provides two additional methods 'out of the box', for both duct and pipe, based on the Colebrook Method and the Haaland Method….these two methods were the top cited from customers and 3rd parties.
Please see this video demonstrating the results of these two methods in 2015 using the sample file you had provided to Product Support. The results on the right appear to be nearly the same, while the results on the left vary from 2.5 to 4%... without knowing more about MagiCAD's method, if they are rounding in the result, or if you rounded in the Revit model, or if there was some other variation in inputs, it is hard to guess where the difference is from.
Sorry for the delay in responding to your inquiry, but we could not report this new functionality until our new product line was officially announced late last week.
Does this appear to address your need in an acceptable way?
Respectfully,
Martin Schmid
Product Line Manager
Mechanical Detailing and Electrical Design
Architecture, Engineering, and Construction
Autodesk, Inc.
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