The generator matrix

 1  1  1  1  1  1  1  1  1  1  1  1  X  X  1  1  1  1  X  1  X  X  X  1  1 2X+2  0 2X+2 2X  1  X  X 2X+2  X  X 2X+2  X  X  1  1
 0  2 2X 2X+2  0  2 2X 2X+2  0  2 2X 2X+2  2 2X+2  0 2X  2 2X+2  2  0 2X  0 2X+2 2X  2  2 2X+2 2X+2 2X+2 2X+2  0 2X 2X  2 2X+2  0  0 2X  0 2X

generates a code of length 40 over Z4[X]/(X^2+2X+2) who´s minimum homogenous weight is 40.

Homogenous weight enumerator: w(x)=1x^0+49x^40+10x^42+2x^44+2x^46

The gray image is a code over GF(2) with n=320, k=6 and d=160.
This code was found by Heurico 1.16 in 0.016 seconds.