EFI Tune for Quietest Possible Exhaust Noise

Make an insert for the exhaust that chokes down the inside diameter of the pipe to say 2” and make it removable with say a simple nut and bolt. 3” is huge and emits a lot of noise. There is a technical term for that - I just cannot pronounce it let alone spell it. lol!

I seen this before: a washer looking item with a long steel stick tack welded.
It drops down the tail pipe(s) and bolts to the side with like a 6 or 8mm nut and bolts.