I would run the universal, because yes its a larger in/out. I still cant figure out which one though, the 53000 is the series on the direct fit, 91000 is the series on the direct fit cali, and 94000 is the series Downey uses. I am going to call car-sound and see what would really be best for out application. We are a small displacment, but can easily weigh more than 4200lbs, shoot my old runner weighed 4900 empty...

 

i got a Schneider cam/low end, and a Downey header, borla exhaust n a performance cat, with a K&N they all work sweet, pulls the 33's with stock gearing pretty good, just turned 270 k

 

You realize the thread you replied to was 3 years old, right?

 

Haha!