The more you do, the less reliable they become?!?!? Only if you don't know what you're doing. Look at the signature below and try to tell me the car isn't reliable....ha!

The intake is usually where everyone starts, then pulley and tune. I don't recommend crank pulleys as they turn everything too fast. Supercharger pulleys only speed up the SC, nothing else. Eurocharged or InMotion for tuning. Anything after that tends to cost about a grand per mod.