Dynatech 2-1/2 x 4-1/2 Merge Collector Headsock Specially designed to mount a

Specially designed to mount a GM Metric D154 series caliper with 5-1/2" bolt spacing to axle tube when using a 11-3/4" diameter brake rotor

Studs are shot peened with a special baked-on dry lube

45 in W x 25 in H x 3 in D

Single Oil Filter Relocation Kit

Dynatech 2-1/2 x 4-1/2 Merge Collector Headsock Specially designed to mount aProduct Description: Collector Slip On Merge 4 x 2 1 2 in Primary Tubes 4 1 2 in Outlet 12 in Long Steel Black Paint Sold Individually Dynatech continues to be the exhaust leader in all forms of racing and high performance applications. You can be assured that you will get all the performance and quality possible from your Dynatech headers.