i believe there is a difference in cat length between early and late cars, im pretty sure there is anyway. the reason is a mate of mine bought a cheap cat bypass off ebay and it was too long to fit his mk2, so we cut it down. on my mk2 i bought a miltek pipe which was listed to fit all mk3s, but it was shorter than my mates one. It came with a seperate length of pipe which then made up the difference.
does it seem too short or too long?