The VF34 with ported/ceramic coated stock manifolds spools about the same as the stock turbo did with the header. I'm almost curious enough to wrap the header and try it again, including running one step colder plugs and having the tuner play games with ignition timing and A/F mixture to try to keep the EGT's higher, but I'm not sure it's worth the $200 for tuning time just for an experiment. Car manufacturers use exhaust manifolds because not only are they cheaper, but they are also excellent in holding in heat. I've since upgraded to a VF34 turbo and better intercooler. The stock exhaust manifold is made of thick, solid cast iron connected to all cylinders, while a header is made of individual lighter and thinner steels that connect to all exhaust ports (think of a twisted metal fork). Even with the ceramic coating the EGT's were just too low, and the header was letting the exhaust cool off too much. And the tuner had to play all sorts of games to spike the boost to even get back that much spool. Had it re-tuned and managed to get back all but 7 hp, but I still spooled 500 RPM later. Then I bought an unequal length header, had it ceramic coated (equivalent to Crucial Racing coating) and lost 40 hp and approximately 1000 RPM of spool. It made 227 whp on a heartbreaker DynoDynamics dyno and spooled insanely fast. I had an EcuTek tune on my car with the stock turbo and stock manifold setup, but complete aftermarket turbo-back exhaust and uppipe. Tuning makes a HUGE difference when you go back and forth between a header and the stock manifold. Will find out when I get a protune again. My tuner (XX-Tuning) said that aftermarket header won't require a retune, but it's worth to recheck it. It's possible that my car was custom tuned to work specifically with Borla header. Top-end power is reduced noticeably while low-end power is significantly improved. It is important to consult with a piping expert to determine the best type of manifold for a specific application and take into consideration all the factors above.Spent some more time today driving around.

Cost: The cost of the manifold should be considered in relation to the overall budget for the project.

Maintenance and repair: The ease of maintenance and repair for the manifold should also be considered in the selection process.

Safety and regulations: The manifold must be designed and built to comply with relevant safety and regulatory standards.

Space constraints: The available space for the manifold will affect the size, shape, and configuration of the manifold.

Temperature: The operating temperature of the system will affect the materials and coatings that should be used to construct the manifold.

Type of fluid: The type of fluid being transported will determine the materials and coatings that should be used to construct the manifold.

Pressure: The operating pressure of the system will also affect the design and selection of the manifold.

Flow rate: The required flow rate of the system will determine the size and type of manifold needed.

Some of the most important factors include: There are several factors to consider when choosing the right type of piping manifold for a specific application. It’s also important to keep in mind that some standard codes and regulations may apply to the design and fabrication of the manifold, and it’s essential to comply with them.įactors for Selecting the Right Piping/Pipeline Manifold Finally, consult with the appropriate professionals and conduct pipe stress analysis, thermal analysis, and hydraulic analysis as needed.Consider the safety and maintenance aspects, ensuring that the manifold is designed to be easily accessible for maintenance and repair and that it meets all relevant safety codes and regulations.Create a detailed layout and drawing of the manifold, including the location of pipes, valves, and other components.Choose the type of valves and controls that will be used in the manifold, such as ball valves, gate valves, or globe valves. So what are the differences between exhaust headers and manifolds The most noticeable differences between these two components are: Heat Emissions Performance Sound Weight Let’s start with the Exhaust manifold, since this is what most cars are equipped with from the factory.Determine the appropriate pipe size, flow rate, and pressure drop for the manifold based on the fluid or gas properties and the number of branches or outlets.Select the appropriate materials for the manifold and its components, taking into consideration factors such as corrosion resistance, pressure and temperature ratings, and compatibility with the fluid or gas.Determine the number and location of branches or outlets that the manifold will need to distribute the fluid or gas to.Identify the fluid or gas that will be flowing through the manifold and its properties, including viscosity, density, and flow rate.Designing a piping manifold involves several steps:

Headers vs manifold