Tomei Expreme Unequal Length Exhaust Manifold Header
Model: 2002-14 Subaru Impreza WRX / 2004+ Subaru STI - Sedan, Coupe, Wagon
Engine: EJ20 /EJ25 Single Scroll Turbo
Chassis: GC8 / GF8 - Year 1992 Nov.-2000 Aug.
Chassis: GDB / GGB A - Year 2000 Aug.-2001 Aug.
Chassis: GDB / GGB B - Year 2001 Sep.-2002 Oct.
All Impreza STI
Wagon Type EJ20
Chassis: GF8 - Year 1993 Oct.-2000 Aug.
Chassis: GG - Year 2000 Aug.
Pipe Diameter: Main 42.7mm / Exit 60mm / Support Pipe Exit 60mm
Pipe Thickness: 2.5mm
Weight: 9.2 kg (Normal 13.3 kg)
Turbine Support Pipe
Upgraded Thermal Bandage (Titan Exhaust Bandage) 20m x 5cm
Bolt Smooth Paste
1.High Efficiency 4-1 design:
We introduced the high efficiency 4-1 as against the STD 4-2-1. The exhaust efficiency of the standard exhaust manifold is not perfect. But Tomei 4-1 type exhaust manifold has high efficiency. You could see the change of dramatically driving feeling.
2.Not-Equal length Design:
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
3.Great Expansion of Bore Size of Support Pipe:
Tomei enlarged the bore size of support pipe f60 from the STD one f42.7. This diameter of support pipe will show the great performance at the boost up or turbine replacement.
4.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.
5.Ultra High Quality:
We design the Lost Wax type strength flange. We are particular about the welding and exhaust efficiency is improved very much.
6.Lightweight and Rust Proof:
We select SUS304 stainless steel which is lightweight and rust-proof.
We prepared bolts, gaskets, and easy and full instruction manual for privator. Everybody can install.
For Offroad Used Only