Add to Cart The item has been added APR TCU Upgrade 8-Speed Tiptronic (AL552 8HP55 ZF8) Audi S4 | S5 | SQ5 | RS4 | RS5 2018+ This product is for Racing Competition only and is not legal for use in highway or street vehicles or other non-racing competition off-road vehicles. Purchasing this product requires you to sign our Vehicle Compliance Waiver here. APR's TCU... $568.67 Add to Cart The item has been added Compare