I've just decatted my 150t, we took the original out and hollowed it out using fire, hammers and chissels. Surprisingly it's quite a tidy job, nothing left inside cat and no damage. It sounds very good, roars and bangs. I've had a custom longlife remap and they mapped it for a decat, so no EML which I was very happy about. My next question is, will I need to tweak the map? Before it was boosting 1.3 bar but now with no cat its only 1.2 bar?