Recently I read a post in the Body section what a fella slid his plastics back and it looked pretty good. I decided to have a go at it as it stated you only needed to "cut the trunck out and thats it", not to discredit his post but there was ALOT more involved than that. Here is the steps I took:
1 - Cut out the trunk box at the 90* angle where it becomes vertical. Clean up all the edges ( I used a box knife ) and get all your line straight.
2 - Remove the front mounting holes ( where the plastics use to bolt up ) This is very easily done but dont cut too close to the air box or remove any material where the bolts come in from the bottom.
3 - At this point you have began to notice that if you push down on the front of the plastics it rocks back and forth about 2 inches. If you try and put the seat on it either will NOT lock in the front or the latch is not long enough in the rear. This is because the old mid mounting bracket on the frame need to be removed, a quick zip and they are gone, clean them up so they dont cut you or your plastics!
4 - Put the plastics back on once the brackets have been removed and you will notice that everything fits flat on the frame, make sure everything is clear of the plastics and that it is fitting the way you want it.
1 - Cut out the trunk box at the 90* angle where it becomes vertical. Clean up all the edges ( I used a box knife ) and get all your line straight.
2 - Remove the front mounting holes ( where the plastics use to bolt up ) This is very easily done but dont cut too close to the air box or remove any material where the bolts come in from the bottom.
3 - At this point you have began to notice that if you push down on the front of the plastics it rocks back and forth about 2 inches. If you try and put the seat on it either will NOT lock in the front or the latch is not long enough in the rear. This is because the old mid mounting bracket on the frame need to be removed, a quick zip and they are gone, clean them up so they dont cut you or your plastics!
4 - Put the plastics back on once the brackets have been removed and you will notice that everything fits flat on the frame, make sure everything is clear of the plastics and that it is fitting the way you want it.
.....but keep in mind, just because you have a +3 swingarm doesn't mean you extend the plastic 3" if you want the same look as before. The swingarm sits at an angle even when you are sitting on it. From a horizontal axis, you may or may not have to go shorter than 3". This depends on your ride height and how much your plastic squats though. If you want to be exact about it, all you have to do is measure it out. If your plastic sits almost horizontal with you on the quad but the swingarm is still diagonal, the "straight" plastic will compensate for "3" of a "non-straight" swingarm....so moving the plastic back only 2.5" for example might be more proportionate.....but like I said.....that is all a matter of PREFERENCE and moving it farther back will allow more room for you to lean through corners without sitting on the fenders which angers me with stock plastic. 
