M135i back box on 116i

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Manufactured from end of 2011

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Re: M135i back box on 116i

Post by marco_polo » Sat Sep 07, 2019 9:26 am

The black plastic box is the valve's motor/actuator. You don't need that as you don't have the wiring to connect to it. There should also be a horseshoe spring, don't need that either.

The actual round 'butterfly' valve lives inside the tailpipe, rotating on a spindle. Making sure the valve is fully open, lock/wire/weld the spindle to prevent it from moving. Job done.
Silver F21 M135i - ManBox - HK - Adaptive + Eibach Pro's - BBS CH-R's - BMWP Drexler LSD - M4 LCA's

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Re: M135i back box on 116i

Post by Haldon » Sat Sep 07, 2019 11:55 am

Thank you Marco, i understand now!

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