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.

Features
*Increased Flow
*Direct OEM Replacement
*Caliber increase
*3-Ply Silicon Couplers

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)