My understanding is that the oil cooler kit is a Nissan Motorsports Competition Part, which is different than a Genuine Nissan Accessory (comes with a warranty).
The Stillen kit is definitely a nice and less expensive solution, but the core is a lot smaller. In terms of capacity the Nissan Motorsports kit is a lot closer to the Central 20 kit from Japan, which is significantly more expensive.
I don't know what Stillen's targets were, but based on the core size shown in their pictures, it seems unlikely that it would provide enough cooling for a 20 min track session at a HPDE in hot climates (80+ deg F).
Not trying to knock the Stillen kit in any way because it looks like a nice kit at a great price. I'm just glad that there are more more (arguably) affordable solutions than the ones from Japan, which can cost a couple grand!
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