Originally Posted by
BoostedK20
Hey Jim, welcome. A tubular manifold isn't necessarily a MUST, but from an efficiency standpoint, I would strongly suggest it. Cast log manifolds are nearly always inefficient and prone to cracking due to heat cycling, as well as limit the size of the turbocharger you can run with them when compared to their tubular counterparts. With that power goal, you can run a turbo setup on a stock motor, as well as a larger fuel pump and injector set; a fuel return setup is not needed. So, no internal mods would be required (depending on the condition of the motor and which k20a motor you're grabbing). A good tune is a must in terms of reliability.
Give us some more info about this potential build! What chassis are you interested in putting the motor into? How did you get interest into the K series world?
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