Air dog or FASS?

Both of them get the job done. I'm running a FASS and it's holding up fine for me. In opinion they are pretty much the same.
 
Which system is better? I want to be set up for around 550 HP.

That's a loaded question as many use both. Both can also easily handle 550hp.

My suggestion is to go with Airdog. You can't beat their product or customer service
 
I prefer Airdog because it is quiet & compact. I've had both. Only thing that I don't like is the fact that they use a wierd filter which can't be bought at local parts houses.
 
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