Spec IV uses the same basic principle as used in all racing spec muffler: straight, light weight and efficient exhaust flow. The racing spec IV muffled has however an additional built in silencer, making quieter then the the Spec III and and Pro Spec muffler. designed with an additional guaranty and sound arresting of exhaust flux use with the street new with the adoption of the super silent structure which is developed in prerequisite, is contrary in the higher-order origin, the inner silencer- not to be install, and also clears safety standards volume, actualizing the wide power band from the medium speed limits to the high-speed limits.

Exhaust efficiency and compatibility of sound arresting it succeeds in balance doing the higher-order origin. When it is usual, sound arresting has kept installing those which become exhaust resistance such as partition and sound arresting valve, We hold down exhaust resistance to the utmost and grope the method sound arresting of doing and the result of trial and error, the straight structure which guarantees exhaust flux succeed in the development of the super silent structure which shows the splendid silencing effect, The material which is formed high endurance, furthermore is the light weight design with all stainless steel.


Exhaust flow spreads due to the silent pipe and exhaust pressure in the circumstance whose of the low and medium-speed time is weak relatively passes the sound absorbing section and is discharged.		Without spreading inside the silent pipe the exhaust gas passes through the flow directly in the circumstance whose exhaust pressure at the time of high-speed high load is high and is discharged.

So far, tail finish of the completely new design there is no type tightens rearview. The shell silencer - with as for connecting tail pipe new manufacturing method and press manufacturing method of non welding are adopted and improvement and light weight conversion of durability are actualized, The tail pipe and the shell silencer which administer slanted slash cutting & cirque ended processing - fusion overwhelms the person who is seen and the existence impression indicates racing spirits.

[ Super Light weight and 0.8 mm thick SUS 304 stainless steel ]

Adopting the main pipe which forms the muffler all 1mm thick SUS 304 stainless steel. In addition, the shell public wall adopts the 0.8 mm thick SUS 304 stainless steel and super light weight actualizes high endurance.

[ Super lightweight band stay hook ]

While the main silencer - as for the installation hook of the section, not to be welding and maintaining strength and durability, adopting the band stay hook which administers the light weight conversion. Contributions to light weight conversion is possible delicate adjustment at the time of installation of course.

Racing Spec brand insignia

Part Number	Type	Model	R.R.P
BC-SP4-AP1	SPEC4	AP1 S2000	£421.82
BC-SP4-DC2	SPEC4	DC2 INTEGRA 94-99	£421.82
BC-SP4-DC5	SPEC4	DC5 INTEGRA	£421.82
BC-SP4-DSL	SPEC4	DEL SOL	£421.82
BC-SP4-EG3	SPEC4	EG3 3DR	£421.82
BC-SP4-EK4	SPEC4	EK4 3D(CIVIC)	£421.82
BC-SP4-EP3	SPEC4	EP3 (CIVIC TYPE R)	£421.82
BC-SP4-GC8	SPEC4	GDB 01-(IMPREZA)	£468.00
BC-SP4-HP92	SPEC4	PREDULE 92-96	£421.82
BC-SP4-HP97	SPEC4	PRELUDE 97	£421.82
BC-SP4-MX5	SPEC4	MX5	£421.82

SPEC IV

SPEC III

PRO SPEC