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I have done about everything I can possibly do to my car but an intake manifold. Does anyone know an intake manifold that doesn’t require much change for the 2020 Subaru Wrx? I have a Mishimoto top mount intercooler so I would need something to fit that setup.
 

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get inlet and throttle body extrude honed. should increase total air flow and more importantly even flow through each inlet track. Do exhaust manifold(if you don't already have extractors) as well ,and heads. When rebuilding make sure to match all gaskets and manifolds/flanges to heads. With all this new free air a retune will be necessary to take advantage of all this. In my situation I picked up more torque and power at less revs and less boost with lower inlet temps. More to be had if you want to push harder.
regards Jim (ex BAT555)
 
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