PMD resistors usually come with a new PMD/FSD. . .
"PMD resistors usually come with a new PMD/FSD module. Mine came with a #5 resistor but after using it for several months I found the acceleration lacking. I switched to a #9 resistor. Acceleration was excellent but my mpg dropped significantly and first time startup in the morning was smokey. The #7 resistor that I ordered gives me good mpg, good acceleration, and less smoke during initial startup."