I was looking into getting the Pacesetter Monza exhaust and half the websites (including Pacesetters) say that it is a 2.25 pipe diameter. The other half of the websites say it 2.5. is there anyone that has it and can confirm the size?

 

mine is 2.5

 

do have any problems with vibrations with this setup?

 

it's a 2.5", and there shouldn't be any problem with vibrations. exhausts don't normally cause many vibrations.