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Dual air advantages include air capacity (saving you time), durability and redundancy. But a single ARB compressor is also reliable, just slower. But the new single brushless ARB compressors have increased airflow and may appeal to the occasional user, instead of the costly dual compressor (new or old models).
I had the small ARB tank on my dual compressor in the Nissan Patrol under the seat. I switched to the larger tank in the Grenadier. My compressor is mounted in the cargo area, up high (above the ORS drawers).
They do look very similar, but there maybe fuse and wire gauge differences based on the current draw (I am still looking for the ARB brushless installation guide). Looks like a big jump in draw but also a big jump in air flow. The new single compressor is 130L/m verse 174.4L/m for the old double air compressor (comparing 12v models). The new single gives you nearly 75% of the old doubles air flow, that is impressive.
