The PT or Garrett 47/80 or 80/47 is a great turbo and actually very similar size to the 88. The 47/80 which I am about to put on fear is actually been tweaked to make the same power as the PT88, but with much faster spool time and ramp up speed. The 80 on a stage II Gn is maxed out at about 8.20's. Now I would think with a bigger Cub an 88 would be ideal