Stainless Steel 4 into 1 Merge Collectors Model:2-1/4" Primary's into 4" Collector Outlet AF4250-450 as the exhaust system heats

as the exhaust system heats up and expands during use

The Aeroflow Performance Subaru conversion fuel rail kit is specifically designed to suit early Subaru WRX and STI with EJ20 engines which comes with a side feed injector from factory

25mm coolant fittings sold separately

1994-2000 Subaru WRX STi

Stainless Steel 4 into 1 Merge Collectors Model:2-1/4" Primary's into 4" Collector Outlet AF4250-450 as the exhaust system heatsAeroflow 4 into 1 merge collectors are made out of T304 stainless steel that is durable enough to stand up to the elements and combine high flow and high velocity to increase and broaden an engines torque curve. The hand porting inside the collector ensures unrestricted, smooth exhaust flow to prevent power loss and excessive backpressure. Inlets are all measured Inside Diameter enabling the tube to easily slip in. Outlets are measured Outside