In this case "performance" and "color" is not an adjective, but a noun, as it is considered a "thing".There are two of them, therefore proper english would be plural. HOwever in these cases either would be acceptable. For example, "the color is nice." Color is the subject, ie a noun.I dunno, if I use just one,
As if the performance of the Civic Type R isn’t exciting enough,
isn't sounds right. But why would having two adjectives change that?
What if I changed "and" to "or"?
As if the performance or handling of the Civic Type R isn’t exciting enough,