S55 original pipe is too small If you increase the boost value or upgrade the turbocharger it improves the last restriction of air flow into the turbo. This turbo intake pipe will improve turbo response, increase air flow and less turbo lag. Part sg713448 was found on the following vehicles: 2' F87 M2 competition   (10/2016 — 03/2019) 3' F80 M3   (04/2012 — 06/2015) 3' F80 M3 LCI   (01/2015 — 10/2018) 4' F82 M4   (02/2013 — 02/2017) 4' F82 M4 LCI   (05/2016 — 03/2019) 4' F83 M4   (06/2013 — 02/2017) 4' F83 M4 LCI   (05/2016 — 03/2019) OE parts Filtered air pipe 13717846270 Clean air pipe, upper 13717846271 Clean air pipe, lower 13717846272