Determine which re-pack kit length is needed for your Pro Circuit silencer.
R304 Std. / R304 Race silencers
Measure the packable length of your silencer, which is the length of the muffler's shell not including its end-caps. Choose a kit with a length that is the next size longer than your silencer's packable length. These kits will compress up to one inch.
Example- If the packable length (shell length) measures 8", use the 7.5" kit.
