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RYDNHI4x4 10-09-2006, 11:05 PM Everyone talks about getting high flow cats(hfc). Is there such a thing. Cause I am under the impression they say there hfc, but really they mark the price up and say there hfc. If you look at a stock cat and a supossibly hfc they look exactly the same inside and out. malibu795 10-09-2006, 11:45 PM they are out there DP had an add on them rather pricey like above 400 each Mark Craig 10-10-2006, 11:01 AM rydnhi4x4, They are out there and they do flow more, but boy oh boy are they proud of them!!! The current cats that come on the 6.6, 6.0 and the 5.9 are actually pretty good at flow as compared to the cats pof just a few years ago. A cat back system will get you 80% of the flow EGT benefits of a front pipe back system on a 2004.5+ 6.6. I have manufacturers wanting to sell me their high flow cats all the time, currently we are taking a watch and see attitude as the cost vs change in flow is just not worth it in my opinion. Mark @ DPPI Spartus 10-10-2006, 08:39 PM how many CFM does a high flow cat need to flow for our trucks? I know a company that makes them for cars, and could probably fab one up for a truck. Unit453 10-12-2006, 01:01 AM I was always under the impression that there are companies who make them. Hell, my LT1's got a set of Magnaflow "high flow cats" and my Crown Vic has a set of them. Now I hear they do not exist. WTF? Has anyone ever done a test to see exactly how much better they flow? | ||