Switching out the variable vein turbo to an ATS Aurora turbo kit. Got the old turbo out. Here you can see the difference in size. I finally got time to work on it again. I also had to wait for parts. The new 4" down tube came with the 90 elbow welded on. Not going to fit with it on. Also I would like to be able to remove the exhaust from the down tube so we made our own connections. I haven't tried it out yet going to take it out for a drive tomorrow. Broke the new turbo in today. It sounds different and has better throttle response. I haven't ran it hard yet going to ease into it to break the turbo in. (7/08/17) So I have been running the turbo setup for a full month now and I am pleased with it. The throttle response when pulling surpassed my expectations. It picks up quick even with the 28k trailer with a load on it.