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Message: [QUOTE="maxxedout, post: 1504098, member: 15749"] I think the stock turbine exducer is 63mm. The stock turbine is a unique design that allows it to be more efficient than you would expect. I had one of the early 64mm Street Max turbos on my 2012, and I remember discussing the stock turbine in great deal with Morgan. He did a ton of testing with different compressor wheels to see how much you could squeeze out of the truck before the boost/ebp ratio was no longer ideal. Long story short, unless you were shooting for well over 600 HP, the stock turbine worked just fine. On the aftermarket side, I believe 66mm and 70mm turbines have been tried. The 66mm didn’t make enough of a difference to be worth the cost of the upgrade, and the 70mm was really only necessary in applications where people were shooting for north of 650 HP. I think AP’s turbo has a 68mm turbine, which might be a good “happy medium”. [/QUOTE]

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