He did that and a lot of other maintenance stuff at the same time. So i just wanted to see if anyone else has done this

 

Depends on the under drive pulley kit that you buy. Some come with only the crank pulley, while some come with all of them. You'll have to remove the A/C and power steering belts to change the pulleys, but you should be able to match up a new belt to fit the new pulley(s). Honestly, the HP gains wont be enough to waste your money on them.