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I have a stupid high HP Volvo C30 running straight pipe from the turbo back, and I welded in a fake 3" cat (just a straight pipe with a shield around it) so upon inspection, they would see I "have" one along with welded in the rear O2 bung even though my ECU does not use it. We do not have emissions where I live.
I saw that above because that would help, if they see you have it, they will let you go... now if they see you rollin' coal they might put 2 and 2 together.
Not have a DPF is a federal thing... huge fines of up to 10 grand. If you just hollow it out though, you will need to insert a straight pipe in to keep flow smooth.