I stand corrected.. what brand though? and is it a true High flow?
And then you have to pay a shop for mandrel bent pipes and such or your cutting performance short... and it will end up costing you more in most cases... mine bolted right on in under 2 hrs.

I only understand the basics but basically the super hot cat causes negitive pressure somehow which aids in pulling gases from headers and combustion chamber improving flow and performance.
.. Its related to what people mistake for the "back pressure" thats beneficial...which as I understand is communicated wrongly that way because many dont understand how the exhaust works....backpressure is actually bad on a 4 stroke exhaust. yet they benefit from the pusling pulling effect of a properly sized one for the engine.

 

It was a magnaflow brand, the listing for it said high flow, but if it truly is i don't know. I did notice how the honey comb crap in there was not near as long as the stock one, if that makes sense. I had to add a short piece of 2.5in pipe on the end of it since the new cat was over all shorter and welded her up myself. Im sure since you had new pipes pre bent and all its probably a better system overall, in the very least it would look better then my ugly welds