supercharging gsr

i was wondering if anyone could shed some light on these questions for me: 1. how much life is left in a jrsc with 20,000 miles on it? 2. how badly would 6psi from the jrsc hurt my gsr with 120k? 3. from my 15.2 with just i/e what could i expect with a 6psi jrsc and i/h/e? thanks alot guys