I believe the "JK" referrers to Just KiddingYour Atkinson engine is normally aspirated (no turbo) and does not need Intercooler.
Normal air is fine for your hybrid. But the turbo on the EB pressurizes air & heats it up. An Intercooler brings the temperature down a bit before it enters the intake.
There are aftermarket air filters for the hybrid that might improve the air flow into your intake. They are much less expensive ($50) than an intercooler ($1000) and something you could change yourself
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