It fits flush in that there isn't any portion (like the middle) that sticks out anymore than the side portions. The main fitment issue is the width, this diffuser is a bit too small width wise.
If I move it all the way to the left I have a noticeable gap on the right and vice versa. When centered there is a larger than factory gap on either side but acceptable with cost in mind in my opinion.
I should have taken photos of the metal mounting strips before I installed it, basically instead of the factory molded in clip type pieces on the OE diffuser, this diffuser has little metal straps that insert into the mounting slots and then you bend the metal strips down to lock it into place.
The outer most metal mounting strips were put too far out to the edges of the diffuser and thus they are not able to go into the outer most factory mounting points on the vehicle, they are useless.
This isn't good, but that being said even without them doing anything once the lower plastic push rivets are in place it seems solidly mounted, I don't think it's going anywhere.
How long those metal strips will last in the way of repeated dismounting/mounting time will tell.
All in all and taking cost into the equation of course I am satisfied with this product, so far.
This first photo shows the metal mounting strip, and the red arrow points to where it should be, this is the case on both sides.
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