High Flow Cats?? - Diesel Forum

skidoo6rev · 09-08-2009, 07:54 PM

I already have replaced the stock muffler with a Flowmaster Super 44 on my 2008 f250 with the 5.4 l. Its pretty loud already but i want it louder! How much louder would the high flow cats make it and where is a good place to buy them?

chuckster57 · 09-08-2009, 08:19 PM

Quote:

high flow cats

Never knew there was such a thing

Clearing Up the Myth About High Flow Catalytic Converters

Little General · 10-12-2009, 05:05 PM

I also saw on Horsepower TV that there is no such thing as high flow cats. I have done what you have done to my truck plus a K&N air filter and no more HP. Makes you wonder why a Lightning or a GT 40 has sort of the same engine except internals and the truck engines rev so slow and sound crappy. I have read a programmer helps, but after $500 and no results, I'll spend my money on something else. If you have 20" rims, save your money for tires, they ain't cheap.