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On cold start, the wastegate pops open to heat the cat faster. I think you're just hearing that... Shouldn't be any great concern as long as it doesn't get worse/happen at other times.
You can turn cat heating off with bootmod3, but I leave it on cause it sounds great!
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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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