Just on this note as well as per above, wondering a similar thing. Going from APS 65mm (stock intake size), back to the OEM airbox. Retune required? The AFM should still be able to figure it out the
ECU should scale fuel ratios accordingly?
Car is tuned (Verso), with the APS CAI, Silicone intake etc.
There isn't a great deal (if any) of flow difference, (just noise), so I would have thought I would be safe going back to the stock box with the resonator removed.