Equal Length Exhaust Header

The GrimmSpeed Equal Length Exhaust Header is engineered to replace the restrictive OEM manifold on the 2015-2021 Subaru WRX and 2014-2018 Subaru Forester XT. The factory manifold's design often includes neck-downs in pipe diameter and suboptimal merge collectors, which impede exhaust flow and limit turbocharger efficiency, ultimately restricting boost and power production. GrimmSpeed's design focuses on equalizing runner lengths and bend angles, crucial for the twin-scroll turbine configuration, ensuring consistent pulse strength for improved spool and performance. This header boasts true equal-length runners, with CNC bending and trimming resulting in less than 1% variance in total length between the longest and shortest runners. The cast merge collector is designed for smooth, consistent flow with low restriction at both the inlet and outlet, preventing opposing flow disruptions and improving directional flow into the turbine. The construction utilizes thick 1/2-inch CNC-cut 304 stainless steel flanges and 14-gauge tubing for enhanced durability and longevity. The runners are welded both inside and outside the flange for improved flow and structural integrity. Key features include full 304 stainless steel construction, a cast merge collector, and single-piece mandrel-bent tubing to eliminate flow interruptions. The header is designed for easy installation, with "No Tune Required" for safe operation and "No Ground Clearance Loss," as it clears the factory skid plate without spacers. A J-pipe/turbo bracket is included to maintain crucial support, and all necessary gaskets and hardware are provided.