The head flanges of our header are CNC cut and faced from a 1/2in thick piece of 304 stainless steel. This design is much thicker than OEM to increase reliability and longevity, as well as to provide additional material to be removed after welding to ensure flatness from flange to flange. This additional measure allows for greater gasket sealing which results in increased performance. The final touch is that the exhaust runners are welded inside the flange as well as outside, this is an extra step in manufacturing, but it provides a rounded lip to improve flow from the flange through the runner.
All of these things come together to make The GrimmSpeed 15-21 WRX Header not only the prettiest on the market, but also among the best performing and durable pieces you can purchase.
Quick Notes:
Full 304 Stainless Steel Construction – Flanges, tubing, collector and badge
True Equal Length Runners – CNC bent and trimmed, less than 1% variance from the longest to the shortest
Innovative Cast Merge Collector – Low restriction inlet and outlet, smooth flow and consistent performance
Smooth, Restriction-Free Flow Throughout – Single piece mandrel bent tubing welded to a single piece merge collector removes unwanted “steps”
Thick 1/2in CNC Cut Flanges and 14ga Tubing – Added durability and longevity
No Tune Required – Safe to run, just bolt on
No Ground Clearance Loss – Clears factory skid plate without using spacers
J-Pipe/Turbo Bracket Included – Retain the support that other aftermarket header lose
Gaskets and Hardware Included – Everything you need to get installed and on the road
Manufactured and Welded In The USA – For consistency and top quality control
