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The reason these cars have loud cold starts is because they retard timing (among other things) after start to heat up the cats quickly. When you have a catless header, most tunes don't change the post start timing which is what causes the rasp. As @steve99 said, you can tune out most of the bark.
My car, for example, has a Borla UEL, stock op/fp, Invidia midpipe and a Vibrant muffler.
[ame="https://www.youtube.com/watch?v=7huYEHd37YE"]FRS Coldstart - YouTube[/ame]
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