Tell your mechanic hey is a a****e
, there are plenty of alternatives, I have the one from FTP fitted on my M135iX - 12/2015 build. Another is for example BMS ( Burger Motor Sport ) a bit more expensive and there are many others.
FTP:
http://www.ftpmotorsport.com.tw/prod...55-charge-pipe
FTP Clone :
https://www.turboperformance-shop.de...pe-13717604033
BMS:
http://www.burgertuning.com/F30_N55_BMW_chargepipe.html
ER:
http://www.evolutionracewerks.com/node/236