The way I deal with it:
1. Close valve(s) ( I have a CG VSC-1 valve controller)
2. Raise rpms slightly after starting the car (100-200 and hold for ~30 seconds)
If you don't want to be doing that each time you cold start the car the only other options will be to either remove the cold start with a tune or to take the sport cat off. Re-adding the oem resonator won't help.
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