Anybody making 500 rwhp with cats
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Your whole exhaust should be upgraded. You really should be running 1 7/8" headers with your power level. An ORY ypipe with a nice merge would also help power, and either run a cutout or 4in catback. Or true duals if you want to go that route.
You'll be over 500whp.
You'll be over 500whp.