12" Sub RMS Power question

[Bad70sbchevy]

Can 50W RMS drive a 12" Pioneer rated at 150W rms and 800W Max? Just wondering if I needed to buy another amp or not. I already have a Dual 300W xpa2500 amp and trying to use it to power 2 Pioneer TS W302 R. My friend had these speakers and amp originally in his car, but he hat the subs running in parallel (2ohms overall) but I just found out looking at the manual that the amp has a minimum of 4 ohms. Should I run these in parallel, series, individually or just buy another amp. I'm not aimin to have the loudest truck on the block, just wanted some good base in my 1970 shortbed (I'm tryin to mount the subs behind the seat where the gastank originally was). Thanks again in advance.