Compressor having capacity modulation or fluid injection systems

A compressor comprising:

• a shell defining a suction pressure region;
• a first scroll member including a first end plate having a first scroll wrap extending therefrom;
• a second scroll member including a second end plate having a second scroll wrap extending therefrom and being intermeshed with said first scroll wrap to define fluid pockets moving from a radially outer position to a radially inner position, said second end plate including first and second passages, first and second recesses, and first and second ports extending through said second end plate and communicating with at least one of said fluid pockets;
• a first piston disposed in said first recess and movable between a first position allowing fluid communication between said first passage and said first port and a second position preventing fluid communication between said first passage and said first port;
• and
• a second piston disposed in said second recess and movable between a first position allowing fluid communication between said second port and said second passage and a second position preventing fluid communication between said second port and said second passage.