TOMEI EXPREME EXHAUST MANIFOLD WRX STi GDB GRB GVB - EJ207

Expreme EJ Twin scroll, which has been highly evaluated in all aspects such as performance, reliability, and quality, has been released to the world with numerous exhaust manifolds, and it has become common to GDB / GRB / GVB and it is new! Pour all the exhaust technology of TOMEI to the extent and finished in a balanced exhaust manifold in all aspects in terms of power torque feeling.

APPLICATION                                               NOTES
IMPREZA    JDM    GD-CD    STI    EJ207    For Twin scroll turbo equipped.
GD-EFG    STI    EJ207
GR/GV    STI    EJ207
WRX STI    VAB    EJ20Y

PIPE DIAMETER & BEND ANGLES

(a) MAIN PIPE ：Φ42.7
The 42.7mm pipe diameter was chosen from the exhaust port to the collector to retain the stock like response.

(b) COLLECTOR ： Φ45.0
A thicker than normal pipe was chosen to increase durability to handle high horsepower & high boost applications.

(c) TURBO SUPPORT PIPE ： Φ45.0
Guides the exhaust gases more efficiently to maximize the Turbos performance potential.　

(d) LEFT BANK
Top priority was given to this section, to be as close to straight as possible.

(e) RIGHT BANK
A larger radial bend to the merging section was decided to minimize heat saturation to the oil sump.

(f) MERGE SECTION
The acute angles allows a smooth extraction of gas flow from each bank.

NON-STEPPED PORT DESIGN

REINFORCED FLANGE & LOST WAX COLLECTOR

KIT CONTENTS

• Exhaust Manifold
• Support Pipe
• E/G – Exh – Support pipe Gasket
• Turbin – Front Pipe Gasket
• Support Pipe – Turbine Gasket
• Cap Bolt
• Flat Washer
• Flange Nut
• Sutud Bolt
• Bandage
• Bandage Band
• Bolt Smooth Paste