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The difference between the stock and GFX sides are minimal but since you have the front and rear already, I would still get the sides just to "complete" the kit unless you're in the process of getting a different type of sides.
Furthermore, if you can still get the sides for a good price, you should get it in my opinion. So I would still keep a look out for them.
Otherwise, I would save up for the JDM visors. Or something else you have in mind.
I just installed the full GFX kit last week on my 06 350 and I would say the skirts are defintely worth it. Although it's a subtle upgrade, it does add a more needed aggressive, beefier stance to the vehicle. Also, it's super easy to install!
at the beginning I didnt think they would make a difference, even when i put them on i didnt think they were a big deal. HOWEVER, whenever you lower your car it is very noticeabe. get them.
when u drop the car you notice it..i just dropped my car its a difference between before and after and also vs my gfs stock sides looking at mine it flares a lot more