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There are two common ways to secretly mount the nitrous solenoids. Our favorite entails drilling two holes in the back of the cylinder block, installing the special NOS-supplied fittings, and mounting the solenoids near the back of the block. You can also drill two holes in the rear of the intake manifold and have the solenoids mounted somewhere near the firewall. However, when the lines exit the intake, a savvy car crafter might spot the nitrous system.