Audi A4 Allroad (B9) Tuning Guide 2026 — Body Kits, Wheels & Performance

The Audi A4 Allroad (B9) occupies a unique position in the estate market — 20mm of extra ground clearance over the standard A4 Avant, permanent quattro four-wheel drive, and the same long load floor that makes the A4 Avant a practical daily driver. The 2.0 TFSI producing 245hp is well-served by the aftermarket, with tuners like ABT Sportsline and Caractere having developed specific programmes for the Allroad's raised proportions and rugged aesthetic. Whether you're looking to sharpen the styling, improve performance on mixed surfaces, or add a set of premium wheels, this guide covers every meaningful upgrade available for the B9 Allroad.

Audi A4 Allroad B9 — Key Specifications

Body Kits for the Audi A4 Allroad B9

Fitting aftermarket aero to an A4 Allroad requires care — the raised ride height and Allroad-specific bumper geometry differ from the standard A4 Avant. The manufacturers below offer kits designed or confirmed compatible with the Allroad variant.

ABT Sportsline — A4 Allroad Programme

ABT Sportsline, Audi's longest-standing official tuning partner, offers a dedicated body styling programme for the A4 B9. The kit includes a front splitter extension, side skirt blades and a rear diffuser insert — all engineered to work with the Allroad's raised stance without requiring suspension modification. Finish quality is OEM-grade, with precise panel gap fitment and durable polyurethane construction. The ABT programme is available primed for painting to any Audi factory colour. Typical retail pricing: £2,500–4,500 for the full kit.

Caractere Tuning — Belgian Precision

Caractere is a Belgian manufacturer with a strong reputation in the Audi and Volkswagen aftermarket. Their A4 B9 programme includes a front spoiler, side skirt extensions and a rear diffuser. Parts are available in both flexible polyurethane and carbon fibre. Caractere offer more design variety than ABT — including more aggressive splitter options — making them the preferred choice for buyers who want visual impact over understatement. Price range: £2,000–4,000 depending on material selection.

Rieger Tuning — German Value Option

Rieger Tuning from Ingolstadt-adjacent Bavaria offer A4 B9-compatible front lip spoilers, side skirts and rear diffusers at accessible price points. Fitment quality is solid and Rieger have significant experience with VW Group platforms. For buyers seeking a tidied-up aesthetic without premium pricing, Rieger is the practical choice. Price range: £1,500–2,500.

Important note on compatibility: Standard A4 S-line aero kits are not directly compatible with the Allroad due to the Allroad's different front bumper lower section and raised arch geometry. Always specify the Allroad variant explicitly when enquiring — Hodoor verifies fitment on every order.

Wheels for the Audi A4 Allroad B9

The Allroad leaves the factory on 17 to 19-inch alloys depending on specification. The raised arch clearance is an advantage when running larger wheels — 20-inch fitments that would cause arch rub on a standard A4 Avant typically sit cleanly on the Allroad without any arch rolling or suspension modification.

Recommended Wheel Specifications

• 19-inch fitment: 19x8.5 ET40, tyre 245/40 R19 — the sweet spot for ride quality and visual proportion
• 20-inch fitment: 20x9.0 ET35, tyre 235/35 R20 — maximum visual impact, still comfortable on Allroad's suspension travel

Recommended Wheel Models

• BBS SR (19-inch): The classic split-spoke estate look. German-made, forged aluminium, superb long-term durability. Suits the Allroad's practical outdoor character.
• ABT FR19: ABT's own branded wheel, designed as part of the A4 programme. Coherent styling if running ABT aero.
• Vossen CVT: Concave flow-formed wheel with premium finish options. Adds a more lifestyle-oriented aesthetic to the Allroad.

Note: when running 20-inch wheels on the Allroad without lowering, ground clearance remains at approximately 170mm — adequate for light gravel and forest tracks, which suits the Allroad's intended use case.

Performance Upgrades for the Audi A4 Allroad B9

The A4 Allroad's MLB Evo platform and EA888 TFSI engine family are among the most well-mapped in the tuning world. Software upgrades deliver substantial gains without affecting reliability when carried out by reputable remappers.

45 TFSI (2.0T, 245 hp) — Remap Options

• Stage 1 remap: 245 hp → approximately 310 hp / 400 Nm. No hardware changes required. Suitable for standard fuel (98 RON recommended). Available from APR, Revo, MTM.
• Stage 2 with downpipe: Approximately 340 hp with a sports catalytic converter or decat downpipe. Requires mapping adjusted for reduced exhaust backpressure.
• ABT Power Upgrade: ABT offer their own mapped solution for the 45 TFSI, rated at 315 hp. Supplied as a complete solution with ABT warranty coverage.

50 TDI (3.0 TDI, 286 hp) — Remap Options

• Stage 1 remap: 286 hp → approximately 345 hp / 720 Nm. The torque increase is the headline figure — from an already impressive 620 Nm to 720 Nm, delivering effortless long-distance performance.

Exhaust Upgrades

• Milltek Sport (non-resonated): Cat-back system delivering a noticeably sportier exhaust note without drone at cruise. Stainless steel, available in polished or black ceramic tip finishes.
• Remus Sport Exhaust: Austrian manufacturer with A4 B9 application. Valve-controlled versions available for selectable sound levels.

Drivetrain note: The quattro drivetrain handles Stage 1 power levels on standard clutch and DSG without issue. Stage 2 on the 45 TFSI may benefit from a DSG software update alongside the engine map.

Interior Upgrades

The A4 Allroad cabin is already a quality environment, but several additions improve driver engagement and practicality for owners who use the car actively.

• ABT sport steering wheel: Flat-bottomed design with carbon or Alcantara trim. Adds a sporting feel to the otherwise comfort-biased interior.
• Aluminium pedal set: Audi-style brushed aluminium accelerator, brake and footrest. OEM fit, no drilling required.
• All-weather rubber mats: Essential for Allroad owners using the car outdoors. Tailored mats with raised lip contain mud and water effectively. Available in Audi OE or Weathertech equivalent.

How an Order Works — From Enquiry to Installation

For buyers new to ordering specialist automotive parts internationally, the following is a step-by-step overview of how a body kit order through Hodoor typically works.

1. Initial enquiry: The customer emails [email protected] with their car details — specifically year (B9 pre-facelift 2016–2018 or facelift 2019–2023), the kit they're interested in (ABT, Caractere, Rieger), and their country. This information is essential because bumper designs changed at the facelift and some kits are year-specific.
2. Fitment confirmation: Hodoor's team verifies compatibility against the specific model year and specification. Stock is checked, or for made-to-order parts, manufacturer lead times are confirmed. Typical manufacturer lead time for body kits: 2–4 weeks ex-works.
3. Payment: An invoice is issued. Bank transfer and card payment are both accepted. For made-to-order or higher-value orders, a 50% deposit is standard, with the balance due before dispatch.
4. Shipping: Parts ship from the manufacturer in Germany, Belgium or the UK directly to the customer's address. Typical transit times: 5–10 working days within the EU; 10–20 working days for international destinations. Full tracking is provided from dispatch.
5. Installation: The customer takes the kit to a bodyshop. Allroad-specific kits are straightforward panel-on installations — a standard fitment typically takes one day. For a full paint-matched aero programme (prep, prime, paint, fit), allow 3–5 days at a quality bodyshop.
6. Post-installation: An alignment check is recommended after any front or rear aero component change, as bumper removal/refitting can affect headlight alignment and occasionally front tracking. No electronic coding is required for purely cosmetic kits — plug-and-play.

Hodoor manages all customs documentation and worldwide shipping logistics. Returns are accepted for unused, uninstalled parts within 14 days of delivery.

Frequently Asked Questions

Does an Allroad-specific body kit work on a standard A4 Avant?

No. The A4 Allroad has a different front bumper lower section and raised arch geometry compared to the standard A4 Avant. Allroad-specific kits are designed to complement the Allroad's proportions and will not fit the Avant correctly. Conversely, standard A4 S-line kits often sit too low on the Allroad and require modification — always specify your exact variant when ordering.

What is the ground clearance with 20-inch wheels and no lowering on the Allroad?

Running 20-inch wheels on a stock-height A4 Allroad maintains approximately 170mm of ground clearance — the wheel diameter increase is compensated by the reduced tyre sidewall profile. This is adequate for light off-road use (gravel roads, forest tracks) which aligns with the Allroad's intended character. Fitting a lowering spring would reduce this and is generally not recommended for Allroad owners who use the raised clearance.

ABT vs Caractere — what's the difference in price and quality?

Both are excellent manufacturers with proven A4 B9 programmes. ABT is slightly more expensive and takes a more conservative OEM-style design approach — the kit enhances the car without dramatically changing its character. Caractere offers more design variations including more aggressive splitter options, and their carbon fibre components add a premium visual element. In terms of fit quality, both are consistently rated highly. The choice usually comes down to aesthetic preference: understated (ABT) versus expressive (Caractere).

Can I order just a single component, such as a rear diffuser only?

Yes. Hodoor supplies individual aero components — there is no requirement to purchase a full kit. Many customers start with a rear diffuser as the first modification, as it adds visual presence at the rear without requiring the more complex front bumper work. Single component orders are processed in the same way as full kits, with the same fitment verification and shipping service.