High Efficiency 4-1 Type&Not-Equal Length Design

We introduced the high efficiency 4-1 as against the STD 4-2-1. The exhaust efficency of the standard exhaust manifold is not perfect. But Tomei 4-1 type exhaust manifold has high efficency. You could see the change of dramatically driving feeling.
The complete equal length is good for the exhaust intervention but reduce the turbine performance and increase the exhaust resistance. Contrary to that, the not-equal length exhaust manifold can lead the efficiency of other cylinders. Tomei design the not-equal length.
*FRAME REQUIRES CUTTING FOR CLEARANCE*

APPLICATION    
IMPREZA    JDM    GC8    EJ207        For Single scroll turbo equipped.
GF8    EJ207
GD-AB    WRX    EJ207
GGB    EJ207
GR/GV    A-LINE    EJ257
USDM    GD    WRX    EJ205
EJ255
STI    EJ257
GH/GE    WRX    EJ255
GR/GV    WRX    EJ255
STI    EJ257
FORESTER    SF5/SG5/SH5    EJ205
SG9/SH9    EJ255

■ 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.
 

■ Dry Racing Sound

We design not-equal length same as STD that is remained the boxer sound. The clear sound which got dry further by change to the diameter of the support pipe and the stainless steel quality of the material is pulled out and the good feeling could be obtained at the acceleration.
 

■ Ultra High Quality

We design the Lost Wax type strength flange. We are perticular about the welding and exhaust efficiency is improved very much.
 

■ Lightweight & Rust-Proof

We select SUS304 stainless steel which is lightweight and rust-proof.

KIT CONTENTS

• Exhaust Manifold
• Turbine Support Pipe
• Exhaust Bandage
• Bandage Band
• Gaskets
• Bolt set
• Bolt Smooth Paste