I encountered the same issue on my 2012. Just install on top of the existing cooler. The tolerances will be tighter and the lines will run slightly different from the Z1 instructions, but it all works fine with the stock size oil filter. No need to mess with the existing cooler. My 34 row has been running flawlessly ever since.
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2012 NISMO #294 Gunmetal Metallic - Stock
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