want to ask who hae been used the muffler without fiber..totally 0 in the muffler..i`m using gze 2 2" piping..the muffler are oval type -s tpye fgk muffler..i buy at chop shop rm120 so already using for 1 year..last 2 month my bunyi have some lain ckit.so go to ekzos shop they tell me my fiber already 0..so i just wanna ask can i still using the mufffler without fiber..can it cos somethingo my eng..bcos when i rev nothing different just bunyi pelik ckit la..in penang no shop can repair it..sayang to buang cos ori jasma fgk..i think it tak bising coz s-type kot..