Simplify the expression: (x^2 / 2a^3)^3 * (4a^4 / x^3)^2

1. Apply the power rule: (x^6 / 8a^9) * (16a^8 / x^6). 2. Simplify: (16x^6a^8) / (8x^6a^9). 3. Further simplification: 2 / a.