I've got on my Hotwheels 210 Vespa a Taffspeed exhaust, the "foam" inside the end can seems to be hardly used as it's really noisy right now compared to the loud "poom poom" noise it was doing before ... The end can is engraved "BSAU193a/1990T3".

Have any of you already changed this "foam" ? what type of "foam" to be used ? I know how to open the end can : bolts on the exhaust side/one large circlip at the end ...
Thanks a lot for your kid help !
