[ktllc15]

I like my 6nz cat. They're reliable and the potential for power is incredible. I'm making around 750 HP and around 2200 ft/lbs at the flywheel. And it's stock internals. Next step for me will be injectors, marine cam and I'm going to switch to compound turbos. None of the other on hwy engines can make the power a cat can without snapping cranks or breaking blocks.

If I had to choose fuel mileage over power I'd go with a 12.7 series 60 Detroit. But blowing by other trucks up 6%+ grades is worth my poor fuel mileage. I passed 35-40 trucks going up donner pass leaving California the other night at 75k pounds smiling and giggling like a little kid the whole time.