I installed a 255 a month or 2 ago and it was cake. Its no big deal to install it. The only things you would have to do are to bend the bracket down so that it is straight and use a hose clamp to secure the pump to the bracket. The 255 is just a bit longer than our stock ones. I dont understand where people are putting this peice of fuel hose as that would only complicate things. It took me all of 30minutes to do it and get it running again.
My 255 is loud as f***, but I just ignore it. People are always asking me what that noise is and I just act like I dont know what they're talking about. btw, my 255 is not rewired but my friends is and his is almost silent.