i have an 84 c10 with a stock 305 and just had an exhaust system put on by my local muffler shop. they did 3 inch from the cat to the muffler, then 2 1/2 dual exit and it made a notiacable increase in the power from stock.(which still isnt good) And then i had the idea of putting on a set of full length headers and my father told me that headers are only good if you have tru duel exhaust. Is this true, and with the exhaust system i have, (and i am thinking about getting rid of the cat or putting a high flow) would headers make a difference and would they be worth it? If so, what kind do you think would be best? Thanks for the help.