APPLICATION：SUBARU IMPREZA WRX STI GDB C-G/GRB A-D/GVB C-D
With many exhaust manifolds released so far, we've always designed our headers with Performance, Reliability and quality aspects in mind. Now we have a new model that is compatible with GDB, GRB and GVB. Introducing the highly acclaimed EJ twin scroll EXPREME header. With the very best of the TOMEI exhaust technology, this new design will deliver balanced optimised performance for power, torque and feeling.
■ Sensational Response!
■ More Power at High RPM.
■ Weight Reduction.
■ Dry Racing Sound
■ Equal Length Design
EXHAUST MANIFOLD （1）
SUPPORT PIPE （1）
E/G - EXH. - SUPPORT PIPE GASKET （3）
TURBINE - FRONT PIPE GASKET （1）
SUPPORT PIPE - TURBINE GASKET （1）
CAP BOLT M10*L=*P=1.5 （3）
FLAT WASHER M10 （3）
FLANGE NUT M10*P=1.5 （3）
STUD BOLT M10*P=1.25 （5）
BOLT SMOOTH PASTE （1）
BANDAGE BAND (Long*3 Short*8) （11）
TOMEI STICKER （2）
EXPREME STICKER （2）
INSTALLATION MANUAL （1）
The kit comes with a 50mm wide x 15m long (1.96" x 49ft) Thermal Bandage.
■DUAL SUPPORT PIPE
The kit also includes a Φ45.0mm (1.8"), SUS304 material support pipe.
KEY DESIGN FACTORS
NON-STEPPED PORT DESIGN
LOST WAX COLLECTOR
PORT EXIT ーCOLLECTOR
COLLECTOR ーSUPPORT PIPE
a : MAIN PIPE
The 42.7mm pipe diameter was chosen from the exhaust port to the collector to retain the stock like response.
b : COLLECTOR
A thicker than normal pipe was chosen to increase durability to handle high horsepower & high boost applications.
c : TURBO SUPPORT PIPE
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.