HELLO,

Have anyone bought the Do luck bumper from this wesite before?

http://www.absdynamics.com/350z/03-0...50Z-DO_592.php

It says in the description direct bolt on, little mods needed.
Now I think the authentic one was selling for over a grand,

 

What makes you think this knock off will fit perfect? A simple google search of absdynamics will tell you about their fitment.

 

I would call to ask them about their return policy before purchasing incase you end up having any kind of fitment issues.

Most aftermarket fiberglass parts are going to need modifications such as trimming, sanding, filling, shaving, etc. Those are considered part of the "minor" modifications and you should expect to be doing it with whatever kit you're getting. That's not to say that you'll need to do that with every kit, but don't go into it expecting it will bolt right on because then you'll end up disappointed (even with a perfect kit, you'll still need to drill the mounting holes sometimes)