HKS Stainless Steel Equal Length Exhaust Manifold - Subaru Impreza WRX STI 08-21

The HKS Equal Length Header (Exhaust Manifold) for the Subaru EJ25 motor works on the 04-14 Impreza WRX STI and the new 15+ WRX STI. It replaces the OEM header for better flow and performance using a 4-1 setup to improve low range and high range performance (mid-range is at OEM level) with all things the same. Increase exhaust flow with the improved spool, providing a win-win situation. This is a great product for those looking to push the power from their OEM turbo setup or those using OEM style 2-bolt flanged pipes. This is also a great addition to lower EGT. This item includes all necessary hardware for an easy installation.

**Going from unequal to equal length will change exhaust note from rumble to a higher pitch**

Please Note

• Main/Bypass Pipe size: 42.7, Main/Bypass Pipe thickness: 2, For WRX STI A-Line 4door SUH409
• NOT CARB Legal!  NO CALIFORNIA SALE!
• OFF-ROAD ONLY!

Applications

• Subaru Impreza WRX STI (2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014)
• Subaru WRX STI (2015, 2016, 2017, 2018, 2019, 2020, 2021)

Features

• 4-1 Exhaust Manifold (almost 4-2-1 setup)
• Quad 42.7mm to dual to single 52mm piping
• Increasing Low/High range power (mid-range same as OEM)
• Can be used with the OEM Oil Pan
• Made of SUH409 Steel
• Made in Japan

Extended Information

• Type: 4-1 Exhaust Manifold
• Catalyzer: none
• Material: SUH409
• Diameter: 42.7 - 52 [mm]
• Chassis: GDB / GVB / GRB / VAB
• Engine: EJ25
• Notes: All hardware included
• Warranty: HKS Manufactures Warranty