Ive got the chance to get a Bkd tdi pd140 turbo thats been machined and fitted with pd170 internals so its now 170spec

Ive been told this will now be capable of 210-220bhp would anybody agree with this ?

Also the bkd turbos are known for been rubber and failing is it the internals that cause this ? As the last thing I want is this turbo failing too