Dan, I downloaded the Donaldson catalog, and did the CFM flow specs, etc.
Your FPG070017 is made of plastic. I'd prefer metal, so the closest metal version is the G065551. Price is very close to the plastic version. It's an inch less in diameter, and not quite 2.5" longer. I think it will work out better on the fender, because that allows the vacuator valve to be placed further to the rear.
I'm going to make cardboard templates of both units, and see which I like best. Unlike your 45, I have marker lights on my side apron that I'd like to clear, and I'm running a second battery, so the plumbing to the carb has to be between the battery and the master cylinder.
Prices are as follows:
G065551 $123.40 (this is the metal unit, but does not include a safety filter)
G070017 $129.78 (this is your plastic unit)
G070018 $128.68 (this is like yours, but has a 90 degree outlet, which I'm curious why you didn't go with this model?)
The downloaded catalog gives part numbers, but no illustrations, for the accessories, like bends, hoses, inlets, etc.
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The question was asked about the benefits of a Donaldson air cleaner. In addition to what was posted, I want a cold air package, meaning I want to bring in fresh, unheated air to the engine, rather than intaking hot engine compartment air. This can be done in several different ways, not just by using a Donaldson air cleaner. I also want to have decent fording ability. Instead of running a snorkel and fitting it to an internal air cleaner, a Donaldson not only makes more sense, but compared to snorkel kits it's a lot cheaper.
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....Apparently, hot rod guys don't like to use anything that isn't cheap, round, and chrome....
Yeah, LOL, that's what's on there now.