can get both with a t4 divided rear.gt42 with 0.96, 1.12, 1.22 options.
hp with 0.81 and 0.96 options.
the exhaust outlet is bigger on the gt.
gt42 is obviously a larger front cover.
but, considering the same rear housing (0.96), would there be any difference to spool time or outlet temps?
has anyone done back to back testing?