2014 ST3. Garrett GTX2860R Gen 2. FBO
At last, a Junits elbow anyone can buy!
For those unaware, the achilles heel with the ATP garrett big turbo kits is the manifold elbow, having two major flaws:
One being the oversized exhaust port. It leaves the smaller opening of the aluminum cylinder head exposed to superheated gases and turbulence which eventually results in the head cracking and coolant spraying out the exhaust. I believe another piece to this puzzle is the lack of support to this port face, which compounds the issue once the aluminum gets hot and soft under boost.
Here is a comparison
The second issue is the EWG port. Most of us don't run an EWG. What this empty chamber does is allows gases to tumble in this area which creates a disturbance in the current of exhaust gases and hurts spool.
Theres a fantastic model created by @Habriant40 on post number 693 of this thread showing these issues.
I better get him on making mine. Definitely do it’s a nicely made piece I came across this flange, it’s an eBay part so take that for what it means. https://www.ebay.com/itm/143671302334 But it may be ok if the one I used is still out of stock, I think @mattdamon33 used it lol Sent from...
If you keep reading, there's a lot of more in-depth discussion about this between page 30 and 40 of the above thread.
@junits15 found a company selling the proper flange for this project and came up with the idea of this elbow that solved both of these issues. Unfortunately the company that made it didn't quite perfectly match it to the ATP elbow causing some fitment issues, nor were they very interested in making more . So i got ahold of our very own @michael_ST who enthusiastically took on the job and over the last 8 weeks has built a jig and produced a perfectly- fitting replacement, and is ready to make more.
Price on these IWG units is $350 plus shipping
Price on the EWG units is $450 plus shipping
PM @michael_ST and he will help you out.
p.s. Installation is easy even if the turbo is still in the car. Just support it and pop the elbow out.
Edit: 1/16/22 to reflect price changes due to material increase, as well as added pricing for the EWG version