Here is my car with same kit as recommended by
teaston and it looks great and yea there is tiny gap on either side of rear diffuser but can hardly tell , if it was cheap nasty kit then
teaston would not have recommended
I got mine painted in Gloss black and Bodyshop fitted same time but you can fit it yourself if you good with tools .
In the other hand if you can afford to pay ££££ for OEM kit then go for that mate but we didn't see the point