DIS-4 and Retard Box Worth It?

[mustangman9812]

Is a MSD DIS-4 and a MSD Retard Box Worth it on a future nitrous setup?

 

[mustangman9812]

Bump

 

[BooWFO]

I know the blower guys really seem to benefit from the dis-4. Been told it helps prevent sprak blowout.
Sorry can't be more helpful.