MACSBOOST Yamaha SHO/SVHO Blow Off Valve

(3 customer reviews)

Original price was: $399.00.Current price is: $259.99.


  • Increase supercharger clutch reliability!
  • EZ 10 minute Installation
  • No drilling or tapping
  • Compatible with Stock airbox (or delete and get the most power available! with our Yamaha velocity stack intake)
  • Highest quality custom Silicone/ barbed nylon vacuum hose connection kit
  • CAD designed perfect fit Silicone hose
  • Highest performance and fastest acting SQV style BOV kit with largest port available
  • Custom marinized SQV valve with stainless steel circlip and our valving specs
  • Stainless euroseal hose clamp
  • Great SQV Sound!


Improve the reliability of your Yamaha WaveRunner FX, Cruiser, GP1800R, FZR, FZS SHO/SVHO supercharger by adding a MACSBOOST high performance blow off valve.  Fits all years 1.8 Yamaha Supercharged engines Boats and Personal Watercraft.

The Kit includes our exclusive heavy duty custom silicone coupler, heavy wall silicone vacuum line, vacuum T, all stainless hose clamp, stainless circlip, gapless hose clamp for BOV port, high quality sequential style SSQV SQV BOV.  Our valves are made custom for us and are set to open quickly.   This means there is no tuning or adjustment needed and the valve always responds quickly and repeatedly to transients. The valve and adapter circlip come pre-assembled.    Easy 10 minute install: No removal of the manifold is required, no drilling or tapping. No Removal of the stock airbox is required.  Add our Velocity stack intake and in 10 minutes transform the power and reliability of your ski.

The SVHO superchargers are known to shear gear teeth, fail clutches, twist supercharger shafts and destroy your very expensive supercharger.  Going from full boost to closed throttle causes the most stress on the shaft, gear and clutch.  The BOV gives a safe place for the compressed air to dump and reduce the mechanical stress on the compressor and clutch assembly.  The MACSBOOST blow off valve is your best defense against premature damage.

The sequential design of the BOV allows for the fastest response of all BOV types while our exclusive industry leading large port ensures maximum flow.

QUALITY: Attention to detail is what makes MACSBOOST the best.  Our silicone BOV host is extra thick, the highest quality and a CNC perfect fit.  We use extra thick silicone vacuum tubing that needs no zip ties, Premium euroseal All stainless gapless hose clamps and barbed nylon hose tees.  Our valve assembly is also assembled with a stainless circlip.  You won’t find this anywhere else!


Product Video

Additional information

Weight 3 lbs
Dimensions 8 × 8 × 8 in

3 reviews for MACSBOOST Yamaha SHO/SVHO Blow Off Valve

  1. Idaliz

    Excellent part Super easy to install and for people like me she’s very loud and I love it now my super charger protective and you cannot beat the price

  2. Cory Bennett (verified owner)

    Blow off valve sounds great, looks great and functions the way it should. He walked me thru installation as well..
    John has also went out of his way and helped answer questions for me about other mechanical issues a friend had on his 2021 GP1800 Svho.
    Customer service is exceptional

  3. CJ (verified owner)

    Good BoV for the price.

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