The blacktop has lighter internals that are also weaker, but it's a bit more rapidly. No damage if you're not performing any large mods, but any compelled induction and you will be needing to uprate the blacktops internals. That's what the resistor pack on some variations of the 4AGE does.Your https://4age-20v-blacktop-for-sal35594.blogtov.com/7218062/detailed-notes-on-4age-20v-blacktop-for-sale