I agree with Boomer. {Don't tell anyone I sed that}
Filter clogged. Prolly best to change pump, regulator, and filter while your there.
Tell us more, or post a photo of the headers and we can help you define them.
I suspect you have {ZX-14} Muzzy headers, not OEM ZX-14 headers.
OEM ZX-14 headers came in 3 styles. Only the early ZX-14 headers did not have cats.
Muzzy made Single and a Dual header system's. Some of the members are using them.
The left muffler hanger on your bike probably came from Muzzy, and the mid pipes/mufflers look like the ones I had/sold.
Ride safe, Ted