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Hi.
i am wondering is someone have tried to change x20xev/xer inlet manifold, to z20let or maybe highflow inlet manifold? Does it runs better? Does the car need engine managment after the manifold change?
I have x20xer and it runs good on high revs but on the low revs the car is not so responsive on the gas pedal.
 

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Not really an improvement as its meant for a boosted engine, better to stick with the dual tract x20xev inlet (if you have one?) with a larger throttle body, or find a lexmaul/dbilas type one if you can.
 
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