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J's Racing Exhaust Inner Silencer

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

Ships in 1-5 Business Days

The J's Racing Inner Silencer 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.