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Even with a Perrin resonated exhaust (one of the quieter catbacks), my car is obnoxious on cold startup.
The full setup is UEL catless header, OP, catted/resonated FP, Perrin resonated CBE.
I don't want to annoy my neighbors, so I literally start with the shifter in reverse and let the clutch out as soon as the engine fires. Any load on the engine quiets it down, but it's probably still 1-2 seconds of roar when I first start up.
My advice would be to get the quietest exhaust possible (maybe Q300) or go back to stock CBE. It's not worth annoying your neighbors and/or dealing with the cops.
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