The FS sport cat/resonator delete combo is downright brutal upon start-up, especially when it's cold outside. It does settle down to a normal idle decibel but that 15 seconds seems like an eternity. Code in the cold start delete. I'm sure some tuner out there has this stand-alone option.
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FSI 3.8L Stg II|6MT|SOUL|IPD+GT3 TB|Numeric Racing|KW|Tarett|Rennline|Raceseng|APEX|Recaro|7.3 lb/hp
VQ35HR|5AT|Stillen|FI|UpRev tune 8k rpm|TransGo|Hotchkis|Whiteline|H&R|Z1|Corbeau|R1 Concepts|10 lb/hp
Left lane campers, GTFO!
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