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Which are considered properly done? Imo the trd looks almost the same as stockThe properly done ones add power but usually not enough to rationalize the expense, especially on a stock motor. For example the TRD CAI adds around 10 hp to the rear wheels but costs almost $400. :dunno:
Same here. K&N 77 on 5.7. Lost bottom end and some MPG. Sounds and looks really cool. It was a gift from my wife or it would belong to someone else by now.The afe on my 4.7 cost me bottom end and a little mpg but it looks and sounds great.
My aem is 4" n have had it for 4 yrs n never had any codes come upI thought 4" will cause it to throw a code?