Header Tri-Y DLM 1-3/4in to 1-7/8in

The Header Tri-Y DLM 1-3/4in to 1-7/8in by SCHOENFELD is a performance exhaust manifold engineered for serious engine builders and mechanics seeking maximum scavenging efficiency and power gains. This tri-Y design represents a core upgrade path for street and strip applications where extracting every horsepower matters. Designed as a drop-in replacement or modification piece, the DLM configuration optimizes exhaust gas velocity and reduces backpressure across a range of engine displacements and power levels.

The tri-Y manifold geometry uses three primary runners that merge into a single collector, promoting superior scavenging compared to traditional log-style designs. The 1-3/4-inch primary tube diameter stepping to 1-7/8-inch creates a precisely calculated transition that maintains gas velocity while accommodating increased flow—critical for naturally aspirated and moderately boosted applications. SCHOENFELD's DLM series combines mandrel-bent construction with equal-length runner philosophy, minimizing reversion and pulse interference that rob power at higher RPMs. At 37 pounds, this manifold delivers strength without excessive weight penalty, and the 20.5 x 10 x 47-inch dimensions fit most conventional engine bay layouts while providing ample clearance for suspension and ancillary components.

Mechanics and engine builders favor this header for bracket racing, street performance builds, and restorations where OEM manifolds restrict airflow. The tri-Y design shines in small-block and mid-displacement engine packages where rpm ranges between 3,000 and 7,500 deliver the greatest scavenging advantage. Installation typically requires custom exhaust fabrication downpipe work, header gasket selection matched to your cylinder head, and exhaust system tuning for optimal results. Verify bolt pattern compatibility with your specific engine platform before ordering, and plan for dyno tuning to realize the full potential of this performance upgrade.