| 1 | Overall Purpose | Decide whether the main objective is visual enhancement, improved airflow, track preparation, or replacement of damaged panels. | For appearance, choose a balanced front lip, side skirt, and rear diffuser combination. For track use, prioritize functional airflow and clearance. | The Audi A3 8P was produced from 2003 to 2013, with visible exterior differences between early and facelift versions. | List the three most important outcomes before comparing designs or materials. |
| 2 | Preferred Visual Style | Choose a clear design language instead of mixing unrelated shapes or aggressive details. | Common directions include understated OEM-style, sporty street style, wide-body appearance, and track-inspired styling. | Simple designs generally use smaller extensions, while wide-body designs may require additional fender coverage and custom wheel alignment. | Check that the bumper, side skirts, and rear treatment share similar angles, surfaces, and edge lines. |
| 3 | Body Configuration | Match the kit to the exact body style of the vehicle. | Select components specifically intended for the three-door hatchback, five-door Sportback, or Cabriolet configuration. | The three-door and five-door versions have different door lengths, side profiles, and rear-quarter dimensions. The Cabriolet has a separate body structure. | Confirm the number of doors, roof type, and production period shown in the vehicle documents. |
| 4 | Model Year and Facelift | Avoid fitment problems caused by differences between pre-facelift and facelift exterior panels. | Use a complete matching set or select components designed for the vehicle’s specific front and rear lighting arrangement. | Exterior updates introduced during the 8P production cycle changed details such as grille shape, headlamp design, bumper contours, and rear lamp styling. | Compare the existing bumper, grille, headlamps, and tail lamps with the kit reference images. |
| 5 | Ride Height and Clearance | Keep sufficient clearance for daily driving, ramps, speed bumps, and uneven roads. | For regular road use, choose moderate front-lip depth and side-skirt height. Lower extensions are better suited to carefully managed driving conditions. | Actual clearance depends on suspension height, wheel diameter, tire profile, loading, and front overhang; the same kit can behave differently on different setups. | Measure the current lowest point and compare it with the proposed kit’s additional depth before installation. |
| 6 | Material and Finish | Select a material that fits the expected use, repair needs, and installation method. | Flexible polymer-based parts suit daily road use, while reinforced composite parts can provide sharper styling but may require more careful preparation. | Common body-kit materials include ABS-type thermoplastic, polyurethane, fiberglass-reinforced composite, and carbon-fiber composite. | Check surface quality, mounting points, repairability, paint preparation requirements, and resistance to minor impacts. |
| 7 | Installation and Legal Practicality | Choose a kit that can be installed securely and remains suitable for local road regulations. | A bolt-on or low-modification design is usually more practical for a daily vehicle than a heavily modified custom setup. | Installation may involve brackets, fasteners, trimming, panel alignment, painting, and professional bodywork. Regulations may address sharp edges, lighting visibility, wheel coverage, and vehicle width. | Confirm mounting instructions, required modifications, replacement-part availability, and local inspection requirements. |