Last two times I bought the WIX SRT-6 Air filter (Wix P/N 46875) it was also a repackaged set of Mann filters. Each box has two filters in it, so for one price you get both filters.

Amazon sells them for $15.25 per box, including free shipping - Amazon.com: Wix 46875 Air Filter for the Chrysler Crossfire SRT-6

RockAuto sells them for $13.22 per box, but you have to pay for shipping.

RockAuto Parts Catalog

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NOTE - The same filters that are used for the SRT-6 are also used on the C32 and SLK32, but they are not the same as the filters as used on non-supercharged Crossfires.

The WIX equivalent to the Napa 2822, Wix P/N 42822 (Wix P/n's are always similar to Napa Gold p/n's, just add a prefix digit) is strangely more expensive than the SRT-6 filters. I imagine that's the only thing that is cheaper for an SRT-6 than it is for a regular Crossfire!

WIX 42822 NA Crossfire Air Filters on Amazon.