Hi, im a beginner so sorry if my questions are bad! ive got a ford mk4 (97 P plate), with a 3000 cassette deck. This stereo system only has speakers at the front (a tweeter n normal speaker in each door) which are both factory. I would like to keep the present speakers (mybe replace them in the future) and would like to ADD some speakers at the back! how would i go about doing this? would i require an amp? what speakers should i use?. I want to keep the big casette head unit but if i have to, replace it with a new casette unit, can i keep the present ones? im on a tight budget though! Thanx for reading, pelase try n help me out!