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I think the other drivers are turning cat heating off.
In a couple of weeks I'm installing my VRSF catless, so I will be able to confirm this.
But I do think it's normal/expected if you just hear it until it revs down. Basically, the car optimizes flow through the cats during startup to get them warmed up quicker. It's an efficiency thing. I think you're just hearing the lack of back-pressure from the primary cats, since you've removed them.
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Current mods
Rockford Fosgate P3 // JBL MS-A5001 // MiniDSP
Ultra Racing Strut Brace // AFe Pro Dry S // PS2 // Custom Inlet // DV+ // FTP Boost Pipes // VRSF Race IC // VRSF Downpipe // ECUTek Protune @ 5280'
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