The rear bumper is the same part number for both types of exhaust, (£435 inc VAT painted and fitted), when they're delivered to us they come with a template to cut the bumper as required for single or double. Both exhausts are also the same price (£250 inc VAT fitted). I prefer the double personally as the single is smaller than the standard Cupra exhaust and protrudes a little too far out for my liking. The black part of the bumper can be colour coded or painted black according to taste at no extra cost.