M177 AMG Blow off valve conversion
M177 Performance Upgrades
Mercedes Mechanical Blow Off Valves
Mercedes M177 Mechanical Blow Off Valve Conversion
AMG performance upgrades
ZAC blow off valve
M177 BOV conversion
AMG Turbosmart

V8 RPA BOV Conversion (M177/M178 engine)

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Full Mechanical BOV conversion for W176 A45 (and variants)
Please note that this is NOT comparable to BOV adaptors/Spacers.

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Colour: Red


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ECU Reflash required?

Availability : In Stock Pre order Out of stock

Full Mechanical BOV conversion for all V8 4 litre Biturbo M177 engines

Please note that this is NOT comparable to VTAs or adaptors that still use the factory valves.

This unit completely replaces the leak-prone factory ECU controlled valves with a purely mechanical valve that is only controlled by boost & manifold pressure. An essential upgrade for those with stage 2 and higher tunes where the factory valves can no longer support higher boost levels.


Mechanical controlled Turbosmart VeePortPro styla Blow Off Valve, specifically made for ZAC.
Mechanically controlled ONLY from manifold pressure / vacuum. No annoying ECU control venting power.
Comes complete with valve simulation terminals, so your ECU still thinks it is doing its job. NO CEL!
Quality CNC'd from 6061 aluminum and anodized in RED BLUE or BLACK.
Replaces both tiny stock electronic/ plastic BOV's with LARGE BOV in about 15 minutes.
Adjustable TurboSmart BOV tunable to your requirements by a simple turn.
Simply tees into factory manifold fitting with supplied tee.
Registered design. Copycats beware.



We want you to be happy! Our warranty is here to back up the faith we have in our products, which are designed, engineered and created in Australia. If you have any issues, please contact us! sales@zacmotorsport.com

ZAC warranty covers defects in materials and workmanship of your ZAC Product for 1 year from the date of purchase for the original purchaser. with the exception of ECU Tuning/Re-Flashing, which have a 30 day satisfaction guarantee.  

Further details can be found here...


What's Included?

Included in the box:Mechanical controlled Turbosmart Valve , specifically made for ZAC in RED BLUE or BLACK.
Vacuum line and adaptor to manifold pressure line
Valve simulation terminals for FL models

Installation Information

Whilst this product is relatively easy for the average, skilled home mechanic to install, we still suggest it be installed by a professional mechanic.
This product requires no special tools to install.
This product does not cause a CEL (check engine light)