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The ever-popular Koso manifold and 34mm TB can now be adopted to your new '21+ Grom or Monkey, providing the gains and space for an oil cooler you've been looking for!

Specially designed for this application, the adapter is chamfered for the best possible flow between the stock head and manifold, but also has the ability to be ported up to 30mm should you choose. This adapter takes the guessing out of which combinations work best for oil cooler fitment as it has been a tried and true combination used for years on the early generations. Simply pick up a 50mm 135 degree intake tube paired with your favorite filter, install, tune with your standalone or CJR/DHM flash, and you're ready to make some real power! Hardware included as well as injector clocking adapter.


34mmT/B is only for photo not included


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