Group 4 group_header Part No. | CH-04A | Commodore detail Gasket | HTG-011 | VB detail Red Motor detail Try-Y design | Prim. Pipe | Sec. Pipe | Outlet | Manual | Auto detail Empty row detail 1 5/8 | 1 3/4 | 2 Slip | Yes | Yes | N/A detail � Bolt holes on inlet manifold may have to be trimmed to clear header plates detail Ceramic coating optional extra. Enquire for price.