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I got a full catless turbo back system - 4” bellmouth downpipe to 3” piping to 4” exhaust tip, I’m all the way out in Rhode Island I’ve never had an issue or pulled and we have inspection stickers out here but in my younger days when I used to drive a little Honda Civic id get harassed all the time for exhaust noise

 

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A 4 inch downpipe is enormous, what kind of air is that thing moving. If I'm not mistaken my 6.7l Cummins had a 4" downpipe and could push 40psi.
It’s initally a 4” bellmouth at the turbo where it bolts up and tapers down to 3” all the way back lol and it’s in the process of a 20g turbo lol
 
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