05-09 4.7L Doug Thorley Headers, group buy

Oh yea. Remember, these are also ceramic coated! Just that coating alone will give more horsepower. Remember, these headers give 30+ HP and 30+ torque gains on the 4.7 v8.

Ceramic Coating Advantages

Ceramic coatings are another way to squeeze out a few more horsepower from your ride. Ceramic coatings are typically used on exhaust components to reduce temperatures. However, their use is not limited to exhaust systems altogether. Ceramic coatings have a very low heat transfer coefficient. This means they do not absorb heat efficiently which makes them an excellent thermal barrier. This is why headers are commonly coated with ceramic paint to keep under hood temperatures low. A byproduct of retaining the heat within the exhaust gas instead of transferring it through the piping of the vehicle is also an increase in power. This occurs because the exhaust gases stay hotter longer which allows them to leave the vehicle at higher velocities. This means a reduction in backpressure and an increase in horsepower will result.

Exhaust Coatings

Ceramic coatings are most popular on headers, and less so on complete exhaust system piping due to additional cost and availability. Although coating both your headers and all the mandrel bent exhaust piping of the rest of your exhaust system would provide the best increase in horsepower. Header ceramic coating is usually available as an option for a few hundred additional dollars when purchasing headers. The coatings themselves are usually very thin on the order of less than a thousandth of an inch. However this is enough to provide a good thermal barrier within the piping allowing exhaust gases to escape the system much more efficiently. Horsepower gains of up to 3% have been claimed by coating an entire exhaust system. In a 300 horsepower vehicle this would equate to roughly 9 hp gained. It is evident that this modification can be a bit costly for the power it returns however it does have additional advantages as well. Ceramic exhaust coatings can reduce under hood temperatures by several tens of degrees Fahrenheit as well. This will keep your engine bay cooler and safer because the excess heat will not affect the fuel lines within the engine bay as much.

Engine Coatings

Ceramic engine coatings are a lesser known and used option to the general public. However the technology is available to coat many parts of the internal combustion engine with ceramics to reduce wear, decrease friction, and lower operating temperatures. Typically piston tops and rings are ceramic coated as well as valves, rods, etc. Coating the piston top with ceramics provides a fantastic thermal benefit. It prevents the extremely hot combustion gases from soaking into the piston material during the explosion within the cylinder. This keeps more heat and energy within the explosion itself which provides more horsepower and torque.

Any surface within the motor that is in contact with another surface while the engine is running will gain an additional benefit with ceramic coatings. An example would include the piston ring to cylinder interface. A reduction in friction will occur that will increase horsepower by allowing the moving components to operate more freely. Depending on how many internal engine components are coated horsepower gains can be anywhere as low as a few horsepower to 30+ horsepower.

Advantages/Disadvantages

The advantages to ceramic coatings are many, including a reduction in friction, reduction of under hood temperatures, and increased component life. However, ceramic coating can be a costly process and usually is not budgeted into many modification projects for that very reason. However with more advanced application processes being developed every year, the prices are coming down and perhaps someday ceramic coating will become an integral step in the production of many engine components.
 
Yep, last week.

Anyone else that wants to get in on this, now is the time. I'm not 100% sure how long Thorley is going to let me do this deal. I think another week or so maybe. After this deal is done, these headers normally sell for $749!

Call/text me at 717-319-2100 to order over the phone, or to order online with a Credit Card, click below

Doug Thorley 05-09 headers ORDER LINK
 
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Mine arrive tomorrow. Been messing with the welder in the shop to get ready for this install. I may end up taking these somewhere, i stink at welding... i need more practice.
 
Oh they look sweet! Too bad I've got too many other things to focus on with my rig! Looking forward to seeing AND hearing the results!

Hoping someone is kind enough to post lots of install pictures for us!
 
17 lbs of sexiness came today!
Thank you [MENTION=9]Jason B[/MENTION]
f7a148bf1ebe70e6a71c9d64e4a36a54.jpg
 
17 lbs of sexiness came today!
Thank you [MENTION=9]Jason B[/MENTION]
f7a148bf1ebe70e6a71c9d64e4a36a54.jpg

Gorgeous!

Doug Thorley 05-09 headers ORDER LINK

Anyone else that wants to get in on this, now is the time. I'm not 100% sure how long Thorley is going to let me do this deal. I think another week or so maybe. After this deal is done, these headers normally sell for $749! ALSO, I CAN THE MAGNAFLOW/FLOWMASTER CATS/MUFFLERS for anyone at great prices.

Call/text me at 717-319-2100 to order over the phone, or to order online with a Credit Card, click below

Doug Thorley 05-09 headers ORDER LINK
 
Dropped mine off to sit inside and thaw out overnight so they can install tomorrow. So excited!

I wish i could be standing right behind them tomorrow with my camera. I wanna see how they do this. That way i can do mine in my shop.

Monkey see monkey do.
 
Remember, the instructions say to leave the motor jacked up one side at a time and tack weld the headers with two bolts on the flange to the head and the Y pipe, then remove them to fully weld it up probably the best idea to me.

For those that haven't found an installer yet. You should always shop around and ask who does installs. Doug Thorley is able to replace the cracked stock with these headers in about 8-9 hrs on an average day with just the R&D manager. Members who are getting these installed can save themselves some cash by checking into a few things before deciding the installer;

1. Have they worked on a vehicle like there’s before?

2. How much experience do they have with exhaust manifolds or headers?

3. What is the main goal of the business? I.e….don’t take your manifolds to a transmission shop.

Hope this helps, and if you have any further questions please feel free to contact me at any time.
 
If anyone knows of or has had header work done in the Denver area, please post up the shop names. It seems the hardest part of this modification is finding someone to install it for you.
 
For those who installed with new cats, is there anything you have to cut off your old manifold? Also, any issues with the new cats?
My manifold and cats are not very old. Im debating getting new cats just to keep my manifold intact and maybe recoup some of my money.
 
For those who installed with new cats, is there anything you have to cut off your old manifold? Also, any issues with the new cats?
My manifold and cats are not very old. Im debating getting new cats just to keep my manifold intact and maybe recoup some of my money.

The cost of installing these headers alone is so high that I'm not going to mess around with trying to reuse the old cats. I'll be buying new cats as insurance.
 

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