Hi All . does anyone know if AU catalytic converters are larger diameter than ea eb ed etc. Want to put headers and 2.5''system on eb. Original cat is 2.25. Swear i heard or read somewhere that AU cats are 2.5''. 'Just thought I would pick up 2nd hand AU cat from wreckers and give it to the muffler guy when he does the whole system.Thanks for any info ,been trawlin the web for ages ,noone seems to know