Expreme Exhaust Manifold - Subaru EJ20/EJ25

4-2-1 Isometric Design or 4-1 Unequal Design

With our ever popular EXPREME exhaust manifolds which is now used throughout the world. Our EXPREME Manifolds have received numerous high appraisals on all aspects of efficiency, durability and performance gains. Now with this new addition to the EJ25 user family we now have a manifold specifically to optimize the EJ25 true power output potential.
 
Lost Wax Collector
The Lost Wax process was used to eliminate cracking from welded weak points and for aiding smoother exhaust gas flow without any interference.
 
Equal Length Headers:
Perfect Pipe Size, All Equal Length.
We designed the headers to be the 4-2-1 layout with φ42.7mm, φ45.0mm, φ60.0mm sizes to help extract the absolute maximum from your EJ25 turbine with the equal length design. The exhaust pressure is controlled best by this layout & you can see the peak power gains & at high RPM.


An All New Boxer Sound!
You will have a new higher pitched racing sound from this isometric design. With 2.5mm thick pipes made from SUS304 stainless steel.Stronger, More Precise.
 
Unequal Length Headers:
Great Expansion of Bore Size of Support Pipe
Tomei enlarged the bore size of support pipe φ60 from the STD one φ42.7. This diameter of support pipe will show the great performance at the boost up or turbine replacement.
 
Classic Boxer Rumble
Keep the iconic exhaust note of non-equal length headers while maximizing performance and exhaust flow.  SUS304 Stainless Steel piping is used to cut down the weight compared to OEM Steel exhaust manifolds
 
Includes:
- Exhaust Manifold
- Turbine Support Pipe
- Gaskets
- Blind Bolt
- Titan Exhaust Bandage
- Bandage Band
- Installation Manual
 
Application: 
- 1993+ STi 
- 1992-2014 WRX
- 2005-2009 Legacy GT (USDM BP/BL)