If anyone is thinking of repacking the exhaust by cutting it open, the exhaust is split in to 2 compartments with an aluminium plate, the front half is packed with wire-wool (this part was ok, tho it may require excess oil/carbon to be burnt off) and the rear half is packed with a fiber glass material this can get burnt away with time so if you want to repack it I suggest you cut the exhaust outer skin in half just behind the spot welds, pull the rear of the exhaust off, this should leave the steel baffle pipe exposed then remove old packing and replace with new, slide the rear of the exhaust back on and get it welded back on.