so is the factory cold air intake just as good as an aftermarket if you use a k&n air filter. or is the aftermarket system that americanmuscle sells better than just installing a k&n air filter? also forgot to mention that i installed a new thermostat after noticing the first time i ran it. i will look at the overfill and maybe try flushing out the radiator this weekend. any theories on the oil filler breathers?
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