What is the major difference in dampners. My car has the 50oz from pepboys but I feel a small vibration. I just installed a 671 blower on the car so I don't need the vibration. Will a pepboys 80.00 dampner work for me or do I need a fuild dampner? I still have a few items that I need to finish the car so I hate to spend the 300.00 dollars on a fluid dampner if I don't need one.