I have FI resonated test pipes and FI 18" resonated catback and the drone was getting to me so I added in side branch resonators which made it more bearable and made the exhaust quieter outside.
An option would be to restrict the airflow with small diameter pipes and resonated mufflers but that would probably raise temps and pressure.
I was actually thinking about switching over to Motordyne to eliminate the drone inside the cabin.
If you want to switch exhaust setups let me know.hahaha
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