I think you will find the fine for removing your cat a hell of a lot more than $300.

I was considering a Tomei catless down pipe for my Rex that rarely gets driven on the street and I'm not cop bait at 37 YO. Still not worth the risk . . .

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"ALLPAWS" 2014 WRX RS 40 - modding very slowly.
2002 Mitsubishi Airtrek Turbo R - Ralliart Edition (daily)
2010 Nissan GT-R - when the Missus let's me drive it :)
Crotch Rockets . . .