Aftermarket Exhaust System: $300
K&N Intake: $250
Full Pulley Kit: $200
Roller Rockers: $300
Coil Pack, Wires, and Plugs: $150
That pretty much sums up the power adding aftermarket for the ford ranger.
Total Cost: $2150
Total Power: Not more than a v8
I stopped wanting to mod my engine because I can get more power with better reliability out of a v8 with out losing much MPG and getting an even better sound!
I figured I'd pick up a junkyard block out of an explorer, do an engine rebuild, add a few small power adders, and get a torque tune for it. Strap it to a 5 spd transmission and install.