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I have a 2003 F150 FX4 with a 4.6L, I am getting an ehaust system not sure which one, would appreciate advice (flowmasters, or ravin). And then I will be getting a cool air intake. I was looking at the ICEMAN. IS this any good. I also heard that performance air intakes can suck in water, and that this can be bad. What would happen if water was sucked in? Would this be a major problem?
Flowmasters are the best in my opinion. I have used them for years on many vehicles.
As far as the cold air intake, I have seen people have nothing but trouble with these things. They scope up all the dust and dirt like a vacuum cleaner. You will be cleaning your airfilter or changing it much more often. I don't think you will get water in tyour engine unless you are running the engine near or at WOT in some deep water. Water in you engine would defenitely a major problem.
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