Termignoni Conical Titanium Black Slip On Zx-4rr Steel terminal with titanium black sleeve. Not approved. Termignoni expands its range of universal Slip on kits, designing the new dedicated stub for Kawasaki ZX-4R. The application of our racing Slip ons allows you to have an easy to assemble silencer, “plug and play”, with removable db killer. Decibel detection: Slip on: SO01 with DBK Ø 35 100dB @ 5500 rpm SO01 without DBK 103.5 dB @ 5500 rpm.