I got a huge increase in performance when mine was removed. With the trap-ox in place there was never any real surge when the turbo came online. It kind of gradually built boost from 2K RPMs to about 3K RPMs, but there was never a point where it really kicked in.

Had the trap removed. Now when the engine reaches 2K RPMs Bam! it kicks in and you're gone. Tons more midrange torque. Where it feld OK for a diesel before, now it feels pretty fast - noone ever thinks it's diesel powered.