The filter is integrated into the fuel pump assembly, situated in the centre of the fuel tank. The replacement filter is a complete fuel pump assembly, minus the actual pump and a few other parts that you have to swap over. As Jocko says, it's a bit of a job to remove, I have a feeling you have to remove one of the front seats to get it out.
To be honest, if you have low fuel pressure, it's more likely to be a failed pump or pressure regulator than the filter. Do it struggle all the time, and if/when the power drops, do you get misfires?