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by jcauto
Sun May 10, 2020 3:18 pm
Forum: Civic Si 2006-2011 Americas
Topic: P0171 with 3.5" SRI
Replies: 5
Views: 4832

Re: P0171 with 3.5" SRI

When intake shopping, I found a lot of companies specifying that any of their intakes over 3" in diameter need to be speed density tuned. Remember that the MAF is only reading a sample of airflow and the ecu is calibrated to determine how much air is actually entering the engine based on intake...