Originally Posted by
HiTechRedNeck73
hi-flow cats reduce back pressure and allow exhaust gases to escape faster...
I seem to remember that some back presure has some power benifts when running straight gas ( i think low end torque). But when running HHO and a lean mix, id think back pressure may have no usefull purpose at all. what do you think?
basically, they take the old cat loose and ram a pipe down in the cat to breakup and reduce restriction in the cat... it's the in-between of hi-flow and no cat at all...
LOL, yeah i was thinking about of that also.
If your vehicle has o2 sensors after the cat, running no cat at all will throw a code on the computer and probably a CEL... the computer compares the front and rear o2 sensors to check if it's working (reduction of o2 gases detected)... without a cat, the gases will be the same and will not be within the expectations of the computer...