Just pulleys and a CAI will not get you upto 240-250 range.
Pulleys may state 12hp, and a CAI may state 10hp - but these are usually based on a stock engine, so when you combine the two mods you do not get 12(pulley) + 10(CAI), you may get 12 + 6 or 10(CAI) + 8(pulley) depending on which is done first.
ex: If you install the pulleys one week you may see 12hp, then a week later you install the CAI you may only gain an additional 6hp - NOT 10hp as stated by the CAI information.
When you combine all the mods the result is not the same as the individual parts state.