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J's Racing Exhaust Inner Silencer (Stainless Exhaust)

WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov

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The J's Racing Inner Silencer for J's Racing stainless steel exhaust system is the perfect solution to control the volume of your exhaust on the street and then run full speed on the track.


  • Inner silencer suitable a range of R304 SUS exhausts from J's Racing
  • Reduces exhaust volume ~ 3-5 decibels (SIS-75) or ~ 5-10 decibels (IS-75)
  • Easy bolt-in installation that can be removed when you go to the track

Designed for these J's Racing Mufflers Only

  • R304-**-** R
  • R304-**-** RS
  • R304-**-** RR (excluding DC5 and EP3)
  • R304W-**-** RS

Not compatible for previous generation J's Racing C304 exhausts and Titanium exhausts.

Cannot be used for 70RR for DC5 / EP3.

Not usable on the following mufflers:

R304-T5 -70RR
R304-B1-50RS R304-S6-50RS

Note:  it might cause damage to the exhaust with the back pressure (exhaust pressure) kept over a certain level.  Please remove it at the race track or on the street when  driving with a high rev range.