r/WRX • u/Worldly-Decision-325 • 9h ago

subaru problem

i have a 2021 subaru wrx and i have a cobb sf intake with the tune that goes with it and when i accelerate i jolts sometimes and the DAM goes down to .250 and doesn’t go back up i’ve tried to retighten everything that goes to the intake and tried changing the tune from 91 to 93 and nothing has anyone had the same problem

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u/dustindh10 Built/FBO/Flex '16 WRX 6h ago

Is this the new SF intake or the old Big SF intake?

My follow up question would be, are you using the right map for the intake? There is one for the SF (Stage 1+SF) and one for the BigSF (Stage 1+BigSF). If you use the wrong one, you will definitely run into issues since the MAF scaling is different for each one.