Actually i believe the recovery file is .tar which needs to be flashed via the sprint update tool. As for the kitchen it is a custom rom builder that allows you customize an update.zip file to you liking using the options listed. The link to the kitchen is here (Haxsung SDX Custom Custom ROM Kitchen)
Finally got a custom rom built and its pretty cool. Nothing really performance wise ive noticed but its nice to change the theme a little.
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