Yah install is expensive, but it's worth it to pay more if the job will be done right the first time. You'll end up paying twice as much in the long run if they're installed improperly.
Gears are a very effective mod, they're probably one of the biggest bang for the buck mods you can do. Pricey, but effective.
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.