Speedmaster PCE148.1004 Qualifier Intake Manifold Chevy LS1/LS6 EFI Inlet: 85mm Non-EGR RPM Range: 1500-6500 Satin Finish Note: This Manifold is a direct replacement for any LS1 or LS6 intake. It has an 85mm inlet that can be enlarged for a 90mm throttle body.