Bill has dynoed this type of mod and it showed no ill effects on the airfuel ratios, long or short term fuel trims, or anything else. He said it showed an increase of 7-8 RWHP in the upper RPMs. If you search, you should be able to find his post on the forums here. I don't remember which thread it was in. The nice thing about the DWV intake mod is that it is completely reversible to be able to return to stock if needed. Nothing is damaged or permanently modified. It leaves no footprint.
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