I have a Dodge Ram 2005 5.7 Hemi V8 with a dual flowmaster exhaust and i was wondering, how better did it make the truck?|||Zero. Just a gimmick. They make more noise but are not less restrictive. These are Cat Back Systems. This means you replace everything behind the catalytic converters. The problem is that it is the cast iron exhaust manifolds and the catalytic converters that are the restrictive part of a modern exhaust system and these cat back systems do nothing to address this restriction. With a modern engine you do not really want to mess with the catalytic converters. This is because there is an oxygen sensor both before and after the catalytic converters. Mess with or remove the catalytic converters and these oxygen sensors will send bogus readings to the engine management computer. These bogus readings will cause the computer to use the incorrect fuel / air mixture and incorrect ignition timing to attempt to compensate for these bogus oxygen sensor readings. The end result is that you will actually lose about 15% horsepower and 15% fuel economy. Your engine is tuned from the factory to run with this known amount of back pressure and altering it usually does not give the desired results. It just makes it louder. Besides, the exhaust drone may get annoying after a while. Personally, here is what I would do if I were you. Leave the pipes alone. They are more than your stock engine will ever need. Instead of Flowmaster mufflers use the Dynomax VT series muffler. These mufflers have a valve inside them that change the characteristics of the muffler depending on engine load. Under light load the valve is closed. This gets rid of the annoying exhaust drone on the highway. But romp on the throttle and the valve opens and you make as much noise as you would with the Flowmasters.|||1, 2 hp and will increase your mpg|||zero and in fact can reduce power if it is not exactly tuned to the gas resonance so each exhaust pulse pushes the previous one out in resonance , critical to the V8 and the wonderful sound they can make as they "burble" along|||so the other answers are completely false... if you really wanna know do a quick google search or check their website i know magnaflow has some tests on some popular brands and before and after results.. im guessing with a dual exhaust you will make about 2 hp but you gotta start somewhere the catalytic converter can be removed quite easily by any exhaust shop i know this because there are thousands of people who do it everyday and still have perfectly normal trucks|||unless you are going to alter the computer for the efi system nothing is going to happen///guy just posted a cold air intake that picked up water and bent a connecting rod/watch what you bolt on/duals sound nice

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