For any wires coming from the pickup to an ignition box I run shielded cable. On cars I have also use shield braid on the wires from the box to the coil. Those CD boxes hit the coil with big V so anything to shield against spikes would help. I did not run coil shielded on the dragster but the wiring already included a pair twisted, which seems to work as well. But the mag pickup to the 7AL3 is shielded wire. Note on shields, you ground one end only.