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HKS Element - The HKS Super Mega flow element is a 2-layer, dual density, wet-type polyurethane filter that uses an impregnated viscid fluid to attract and stop damaging dirt particles from entering your engine

TRF Element - They are engineered with a single polyurethane foam layer with larger pores than standard Super Filter elements to allow greater airflow efficiency.

Basically, the regular elment has 2 layers, normal plus a more dense inner material.

TRF has just a thick version of the outer layer filter with wider holes and no dense inner material.

I've used HKS for years.. no problems... They do not fall apart unless you wash them or use them beyond their life span.
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