The manifold collects the exhaust gas from two or more cylinders and puts them into one pipe. The manifold needs to be heavy duty because of the high temperatures, so they are often made of cast iron.
An additional system that is occasionally used with diesel engines is an ammonia system. A small tank of ammonia stores the liquid. It is then sprayed as a mist into the system. The ammonia spray bonds with nitrogen gasses and breaks them down into non-toxic, odorless and biodegradable elements. They are then burned away much as particulate are and the rendered exhaust is that much cleaner.
The large car companies of the past did not want any new technology exposed that would undermine their ability to make a large profit as do the car companies of today. They have spent billions of dollars in the creation of the current technology and in building the infrastructure necessary to support them. The shareholders of these large companies would not like it too much if all this progress was undone by a big environmentally friendly option.
Three of the boost control mods are: Bleeder-T Mod, Clamp Mod, and the VSV Bypass Mod. Each of these modifications raise boost levels without the use of a boost controller. But you have to keep a close eye on your boost gauge, and make sure they are not allowing the turbos to boost too high (18psi is a safe level).
Yes, the stock fuel system is very safe and reliable to 450RWHP, although I would recommend a fuel pulsation damper bypass. Anything over that, and I would highly recommend having the car dyno’d, and using a wide-band O2 sensor (not a cheap A/F gauge connected to the stock O2) to check the fuel ratio at your high boost setting. 11.5:1 would be a safe fuel ratio.
Many things can produce high HC’s such as too much or even too little fuel, not all cylinders firing, advanced timing, bad catalytic converter price guide, or an air pump that isn’t working. These are the most common causes. Tune up’s can prevent most emission problems. NOX is generally worse on higher compression engines. All engines produce NOX but the use of EGR valves will cool and slow down the burn rate of the engine’s combustion. This considerably lowers NOX values.
The Primary Turbo is the only one with a wastegate. When in full twin turbo mode, the boost of both Turbos is regulated by the primary turbo’s wastegate. So, only connect it to the Primary’s.
You have to cut the tube on either sides of the converter. Use the reciprocating saw as well as the metal blades. Leave an allowance of 2 inches of tubing on the ends of the converter for the needed spacing. Allow the catalytic converter to fall by its own self but make sure you are not underneath it when it falls.