I'm wanting to swap out the 3.0 v6 in my 2006 mazda 6 with a more powerful motor and didn't know if it is possible and if so what motors would go pretty easy.

 

Anything can be installed, provided you have the money for it. I haven't seen to many people/or any at all doing motor swaps on 1st Gen 6's. But, there's always a 1st time for everything. What type of engine are you thinking, the 2.3L out of MS3/CX7?