Reel performance depends mostly on the design and the quality of factory machining and assembly. Except for bearings/bushings, drag discs, and handles, few reel parts are upgradable. So you can't make a silk purse from a sow's ear. I upgrade parts with "better than stock" when they are worn. I replace handles if I want a longer one. I keep it clean and properly lubed. Other than that, you get into supertuning, which is mostly about polishing to reduce friction and obtain longer casts. If you aren't careful and don't know how, you can screw it up worse than when you started. I understand the attraction but it's a lot of work to get 10 extra feet of casting distance, and it isn't permanent. I envision guys with supertuned reels sporting $75 carbon fiber handles arriving at the lake in 10 yr old Honda Civics with $20,000 of aftermarket speed and bling parts ;D Nothing wrong with that but it isn't really about fishing, is it?