ETS Maxflow V2 Header - Fits 2004-2021 Subaru STI

We designed our ETS V2 MaxFlow Header to be a direct factory replacement header. We start off with large 1 7/8 primary runners that come together in a true low angle 4-1 merge collector that then flow into a huge 2.5" secondary for maximum scavenging and exhaust flow.

Features

• 1 7/8" primary runners with 2 1/2" secondary for maximum flow.
• CNC mandrel bent runners.
• Custom .100 USA made thick wall tubing for durability.
• Low angle 4-1 merge collector for maximum flow and exhaust scavenging.
  
• Slip fit connection for ease of removal and installation.
• 2-bolt or Vband up pipe flange options.
• Stock replacement design.
• Low profile design for maximum clearance. 
• Confirmed Fitment with XL Oil Pans like IAG and KillerB
• Surfaced flanges for a leak free seal.
• 304 Stainless steel construction.
• 100% built in house and made in the USA.