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Originally Posted by FordeatinZ71
it's also bad for your valves when you run with no mufflers. because of the sudden temp change after shutdown. see, your exhaust blows out while your motor is running, sometimes when you shut down there is a brief and very slight vacuum effect...and even without the vacuum effect, cold (colder than what your engine is pushing out) air rushes in...if your valves are open this can lead to valve warpage due to the temp change...that's what the experts say...
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If I had a dime for every time someone tried to feed me that, I'd be a rich SOB. I've run many a car with open headers for VERY extended periods of time with no ill effects. Besides, it sounds badass!
