The SRT6 is just eligible for the 3/36. They will not give 7/70.. I was told due to high performance vehicle. It's not you. You should be able to get any remaining, being second owner.
You need to look at the in service date. 05 to 08 = 3yrs. You may be better off taking the $150 and buying an extended warranty. I bought mine from Chrysler Dealer. They were cheaper than third party. Most dealerships hate third party warranties. IMO..