Let the full price of each Wild Wheels diecast car be denoted as \( p \). During the sale, each car is marked down by $2, so the sale price of each car is \( p - 2 \).
Max purchases 6 cars, and the total cost he pays can be represented as:
\[ 6 \times (p - 2) = 57 \]
Now, we will simplify the left side of the equation:
\[ 6(p - 2) = 57 \]
Distributing the 6 gives:
\[ 6p - 12 = 57 \]
Next, we will solve for \( p \) by adding 12 to both sides:
\[ 6p = 57 + 12 \] \[ 6p = 69 \]
Now, we divide both sides by 6:
\[ p = \frac{69}{6} \] \[ p = 11.5 \]
Thus, the full price of each Wild Wheels diecast car is:
\[ \boxed{11.50} \]