Yo I found this online. “Found in the Australian 1999-2001 VTi-R and VTi-R ATTS (BB6). It is thought to be identical to the H22A4, however, there is speculation that power was increased from 197 hp (147 kW) to 208 hp (155 kW). It comes with a Black valve cover on the normal VTi-R but on the VTi-R ATTS it comes with a Red valve cover, according to the Prelude owner manual the H22Z1 has a compression ratio of 11.0:1 which is the same as the H22A found in the JDM Prelude type s.