Just wanting a quick guide to what these parts are worth, in your opinion of corse.

Cupra splitter

Full piper exhaust decat - £300

Front front brace - £50?

Solid upper boost pipes (intercooler to inlet)

Black coolant bottle cap

£20/25

not sure, I just paid £300 for a full 2nd hand custom decat if that helps?

again not sure

will give you £40 :P

£5/8 (i paid £12 a few weeks ago for a new one)

I paid £50 for my strut brace. It had recently been powder coated too

Thanks, updating the original post with prices (not for sale just to keep track)