I used one and it did crack, I cut of the t3/t4 flange and got it re welded parallel to the head flange to take out the angle for the silvia and also to reduce the height, it cracked by the waste gate, but to be fair I made an adapter to move the waste gate to the side and that was extra weight along with the waste gate and the dump tube, if you can redo all the welds and brace from the head flange to the turbo flange it should be okay.