Should I purchase new parts, such as tune-up items at the dealer, or should I just go to an AutoZone type of store? Could non-dealer parts actually be of better quality than the dealer? Are custom-fit spark plug wires only available at the dealer??

 

anything u buy for ur teg should be OE stuff. anything for tune up, starter, alt, brakes, hoses, plugs, and wires.........anything
u just have to search for them to get the best price. dealers usually have their prices jacked since they are using a price matrix.
try http://www.ahmotor.com for all ur OE stuff. they have good prices and great customer service
never use parts from autozone unless ur desperate or u need like car/wax stuff.....