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I have a 2020 wrx subi and i wanted to change the exhust of the car to Magnaflow so is it mandatory to tune the car because my friend said that subi engines are so sensitive o_O Also i wanted to install a blow off Valve also and does it need a tune after that? thanks in advance
 

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Anything to do with changing the airflow will require a tune. If done correctly the subi boxer engines can be practically bomb-proof. However if even one small piece is out of whack with the rest of the setup you are in for potentially expensive problems.
 
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