I personally think that AKG messed up trying to separate the K167 and K267 into different headphones. They should have taken the best attributes of the K167 (compact headband, highly isolating design) and the K267 (removable cable, some (but not all to reduce weight) metal-framed items) and put them together to make one fantastic can.
The bass boost function of the K267 has shown itself to be a complete waste of time; in fact, it seems to be a detriment as it reduces the overall isloation of the headphone, and feels cheap to boot.
So is the K267 actually the same sound as the K167 but with just slightly better build quality?
Do they use the same drivers?