HIGH EFFICIENCY 4-1 TYPE
They introduced the high efficiency 4-1 as against the STD 4-2-1. The exhaust efficiency of the standard exhaust manifold is not perfect so the Tomei 4-1 type exhaust manifold took advantage of that. You could see and feel a dramatic change.
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 designed the unequal length.
GREAT EXPANSION OF BORE SIZE OF SUPPORT PIPE
Tomei enlarged the bore size of support pipe (60mm) from the STD one 42.7mm.
DRY RACING SOUND
They designed the UEL similar to the OEM so that it kept the+ boxer sound.
LIGHTWEIGHT & RUST-PROOF
SUS304 stainless steel is lightweight and rust-proof.
Bolts, gaskets, and full instruction manual is included.