Yeah, I'd check the turbo fins/bearing for any play. I installed my VRSF catless and I'm not experiencing the stuff you are. I also checked my wastegate nuts and they were still very tight, so I didn't mess with anything.
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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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