Buzzing exhaust sound???

I just got my new exhasut. Though it is real deep sounding, it whistles or buzzes when I slam the gas. Also sometimes just driving normal. Would a resonator help me? or a high flow cat?
Oh by the way i have custom 2 1/4 piping with fireball muffler,with the cat removed.
thx

I think it’s the resonator. It’s suppose to filter that noise…someone please confirm.

Regards,

Oz

The resonator made a damn big difference. Now all the buzzing is gone and the tone is even deeper. A bit quiter too. A resonator is a must for custom exhaust.
Thx oz