^^^^
Yes I was thinking exactly the same about yours being a silver - It will look the part, as it does on Shabba's Steel Grey car. I think I was the first in the UK to fit the OSIR front splitter to a Mk5 GTI and I chose it very much based on thinking that it looks OEM+ rather than stick-on aftermarket body kit. The vents line up with and match the GTI's foglight panels.
I can't see from your sig pic whether your side valances are the original black or have been colour coded, but if still black, I wager that you'll be wanting to colour code them so that they blend in better with your OSIR front splitter when viewed from the side. Then you'll be probably looking at your rear valance options for the way they look with the sides
Do you have a build thread or a member's ride thread on the go? I may even have posted in it but forgive me for not remembering.