Bankdude

Im sure dat. The GTX efficiency on the primary will help a bunch to offset secondary restriction. Thus the internal working.
But mere mortals like me can only drool at GTX's....and I don't think you can class that as water injection....

Tate

External gates won't ever hurt you as long as they are functioning properly. Getting them to seal seems to be an issue for some, especially at higher heat. More leak points, both Mike and Rob have had issues with that. Internal gates just have the issue of being undersized. The GT3782 only wastegates the rear volute and the flapper is pretty small. Its not the ideal setup. The S300 (especially the SS housings) have it beat hands down in that regard. I think my biggest restriction isn't the stock waste gate, but the 1.00 A/R housing on the primary. A 1.28 T6 would be a lot better for top end flow, but I wanted to see what this Tial housing was about. I think it would be much better suited for a single turbo application. Being a daily driver, I rarely go over 2500 rpm, so I want it up quick. On the dually, I had the 60 psi gauge pegged by 2k rpm, so it fits the bill. We'll see if the stock cammed 12v will be close to the same.

Mike Holmen

Tate you still running a stock cam on your 12V? I thought you put in a cam when you did the head? You are right, that tighter 1.0 housing on the primary will really help her to spool back up. I think that Tate has one of the best set-up going, time will tell. I'm running a T4 housing on the GT4202 I think for my GT3582R over GT4202, I had no egt's issue, but I have no fuel. Spooled decently enough to blow off my intercooler boot on the passager side.

Bankdude, ya GTX turbos are whizzy as it gets, but twins work well regardless of which turbos you run. You can run your stocker over a S475 and pickup a bunch of power and drop your egt's.