...although, looking at a crop of one of the professional shoots we did (for BMW Car magazine), the original but worn sticker on the plenum is much more purple...so I wonder if the bluer ones were later replacements to tidy the car up, because you can see some stickers over the original badges in some shots.
'Original' plenum colours?

Later sticker (you can see the edges of the sticker)?

'Original' plenum colours?

Later sticker (you can see the edges of the sticker)?


