If you've already read our A4 styling buyer's guide, this is the pricing follow-up: what does a full body kit actually cost on an Audi A4 once you add up a splitter, side skirts and a diffuser? Here's a straight breakdown of A4 body kit costs in the UK in 2026, and what changes the price.
What Drives the Price
- Generation — B7, B8, B8.5 and B9 A4s use different bumper and arch profiles, so parts are cut per generation and aren't interchangeable
- Trim — standard A4 and S-line/S4/RS4 bumpers often need different splitter and skirt fitments even within the same generation
- Material — ABS is the budget-friendly option; carbon fibre costs more but saves weight and gives a sharper, factory-look finish
- Coverage — a front splitter alone is the cheapest entry point; a full kit (splitter, side skirts, rear diffuser) costs more but transforms the car front to back rather than in isolation
Typical UK Price Ranges (2026)
- Front splitter only — the most common starting point for A4 owners easing into styling changes
- Side skirts — usually priced similarly to a splitter, sold as a pair
- Rear diffuser — typically the most expensive single part given its size and the precision needed for a factory-look fit
- Full kit (all three) — buying as a set is usually better value than buying each part separately over time, and guarantees the parts are designed to match visually
Carbon fibre parts sit above ABS across the board — expect a meaningful premium for the weight saving and finish, particularly on the diffuser given its size.
Fitting Costs
Most A4 splitters and skirts are designed for a straightforward bolt-on fit using the included fixings, so many owners fit these themselves in an afternoon. A diffuser can be more involved depending on your exhaust configuration, and painting/colour-matching ABS parts is an additional cost carbon fibre buyers skip entirely since it's usually left in a gloss or matte weave finish.
Is It Worth It?
The A4 is a common sight on UK roads, which is exactly why a well-fitted splitter and diffuser make it stand out rather than blend in — a factory-look kit sharpens the stance without looking like a bolt-on afterthought. Because fitment is generation- and trim-specific (B7 through B9, standard vs S-line), it's worth confirming your exact bumper before ordering.
Shop Audi A4 Parts
Browse our Audi A4 collection for splitters, diffusers and side skirts across B7 through B9 generations, in both ABS and carbon fibre.