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I'm willing to bet the internals are different. Firstly, the VTs were running 18.5 psi up to 2014, and then they dropped it down to around 15 psi. The ES peaks out at 12 psi, so definitely something different going on. They're going to have to dig into the block and find out what pistons and rods the car is using to know anything for certain. they upgraded both from 2013 to late 2014 in the VT, and then again in 2015. So no one knows at all what's happening in side this block. The 2013 VTs were ticking time bombs if you did anything even remotely aggressive with them. The 2014s were hit and miss. From '15 on up you didn't see motors blowing up the way you did with the 13s and 14s. With all of that in mind you can see why the folks at Tork aren't too keen on saying what can and can't be done at this point and what the longevity might be. They could have gone back to weaker pistons and rods due to the lower amount of boost that the car runs - they could have gone bigger. It's really hard to say.
 

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Yeah in another thread Tyson was suspecting that turbo might be slightly different (hence my longclock comment) you can give a bigger turbo less boost and not change out internals.
That's true, but there are other ways to get the same power out of a motor with less boost without changing the turbo.
 
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