A: For the 3.5" MAF upgrade
you can order the cold air kit for the Z3 3.0L model.It is equipped with the 3.5" top piping and connector
for optimal performance gain, Check the link below: https://cosmoracing.com/en/bmw-2000-2002-roadster-coupe-3-0l-m54-air-intake-system-cai-cold-air-bmw
Answer provided by: Cosmo (03/04/2024)