When I bought my SRT6 in 2012, I drained the system and as I was replacing the stock heat exchanger with a larger one from EC, I did drain the intercooler also. I had it jacked a bit at the rear and it had been down a bit to start with but I got a little less than 10 1/2 qts, when I filled it, it took 11 1/4 qts. I never heard the 15+ qrts for an SRT but I am curious about the systems "not connected" thing as I did purchase Robs isolation kit.