To perfectly honest, any swap you consider will be costly. Nothing in the world of engine performance comes cheaply. Once you have intake and exhaust the price goes up for smaller and smaller HP gains. Like any rule, the trend can be broken and once certain upgrades are done you can increase power cheaply...but still the sum of the parts never quite equals the whole.
Ex: Buy a nitrous kit, okay, but from a basic kit you can go to a bigger shot really inexpensively.
Ex: Go turbo, expensive, but once there you can tune up your boost level inexpensively.
Ex: Buy a nitrous kit, okay, but from a basic kit you can go to a bigger shot really inexpensively.
Ex: Go turbo, expensive, but once there you can tune up your boost level inexpensively.