Apico Exhaust Silencer Loose Wadding.
Keep the noise down and the performance up.
A good way to check if your silencer needs repacking is to tap on the outer surface at various points.
If it sounds hollow at any point then its best to repack.
If it makes a dull thud then its usually ok.
If in doubt just repack.
Please wear gloves when repacking to avoid skin irritation.