So back to the subject... from Diesel Power Magazine
"...the bigger news is an improved, more powerful 6.7L Power Stroke V-8 that will be shared across the Super Duty lineup. The second-generation 6.7L’s most notable change will be a Garrett GT37 VGT turbocharger replacing the single-sequential GT32 VGT unit on today’s truck. Based on what we believe to be the popular Garrett GT3788VA PowerMax aftermarket turbo, the new GT37 loses the dual compressor wheel design for a traditional single wheel to improve performance at high altitudes..."
Read more: http://www.dieselpowermag.com/features/ford/1402_2015_ford_f_450_platinum_first_look/#ixzz2te51w9We