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I love how quickly my 7.3l warms up. I suspect the stock headers play a big part into that equation. If I remember correctly aftermarket high flow headers tend to shed heat much more quickly than stock, thus the engine takes longer to warm up.
I think when 5 star tested the headers they really did not find much increase. The factory manifolds look pretty free flow to me. Where they did pick up some power was the merge pipe, aftermarket ones did make some extra HP. Supercharger is where the power is at, Whipple has been released and I think it is 700 hp for about the same money as ordering the diesel option. Headers are what $2-3000? Even IF you gain 20 hp, that isn't much value per dollar.
The stock manifolds are pretty close to shorty headers as-is. Not worth the cost or effort to change them IMO. Read the fine print on that "18hp" claim...I bet custom tuning, intake/filter, full exhaust, etc. are in there to get that full number....
The stock manifolds are pretty close to shorty headers as-is. Not worth the cost or effort to change them IMO. Read the fine print on that "18hp" claim...I bet custom tuning, intake/filter, full exhaust, etc. are in there to get that full number....
The same argument can (has been) made for Cold Air Intakes, The 7.3L equipped trucks already have a highly efficient CAI. The same can be said here, the factory header is so well designed that replacing them with aftermarket isn't going to yield much in the way of benefit, and may make matters worse.
With 430 HP to start with, an increase of 18 HP is 4% (or there about) But it's your truck and your wallet.
The stock manifolds are pretty close to shorty headers as-is. Not worth the cost or effort to change them IMO. Read the fine print on that "18hp" claim...I bet custom tuning, intake/filter, full exhaust, etc. are in there to get that full number....
Stock manifolds not even close to an actual header....Once you actually see the header.
Increase in power..Maby, but I doubt it. Engine does seem to rev easier w/ less throttle input (precise calculations from my foot dyno) Sounds fantastic w/ True dual exhaust. Was it worth $3K ? It was for me! but I wasn't looking for more power, only more "Fun Factor"
Stock manifolds not even close to an actual header....Once you actually see the header.
Increase in power..Maby, but I doubt it. Engine does seem to rev easier w/ less throttle input (precise calculations from my foot dyno) Sounds fantastic w/ True dual exhaust. Was it worth $3K ? It was for me! but I wasn't looking for more power, only more "Fun Factor"
Stock manifolds not even close to an actual header....Once you actually see the header.
Increase in power..Maby, but I doubt it. Engine does seem to rev easier w/ less throttle input (precise calculations from my foot dyno) Sounds fantastic w/ True dual exhaust. Was it worth $3K ? It was for me! but I wasn't looking for more power, only more "Fun Factor"
"Not even close" "increase in power Maybe but I doubt it"
So they look cool and sound better but the performance is pretty much the same? To me that means the stock manifold must be pretty close....
I have had lots of vehicles with headers, even Banks headers on my motorhome, all of which made a substantial power improvement. The stock manifolds obviously work or there would be a substantial increase in power by changing to headers. That is generally why I have done headers. Pretty sure the dyno results confirm the stock manifolds are VERY close when it comes to power.
The maximum power increases with headers or an intake are at the point of maximum air flow, redline. How much time do you spend there?
Most of the time there are efficiency gains throughout the powerband. Obviously max gains are generally at the very top but that doesn't mean there are not gains to be had if airflow is compromised in general. Headers and exhaust were a HUGE gain on my 460 powered motorhome, which was rarely at redline.
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