I am new to the forums and just bought a 2003 MG cobra. Car came with a motoblue pulley. I believe the size is 2.75. After seeing all the bad reviews about motoblue I am worried about having this pulley on my car. What would be involved if I wanted to swap out pulleys for a RR or billetflow. Does the car need to be retuned for the different pulley if its the same size? Would I see any increases in power switching from the 2.75 to say a RR 2.65. Just for reference, the car made 474/464 with the motoblue pulley on it. Thanks in advance for the help.