In addition to installing the APS kit as it has on many C6s, Redline will also be doing a custom tune on the E38 computer. On higher horsepower, boosted applications, the ZO6's ECM has proven quite limited when it comes to fueling control with larger injectors (needed to feed these power levels), according to Howard, Redline's proprietor and expert tuner. With a bone stock motor and 6psi, no issues were to be expected. However, with the modified motor and increased boost we could only hope that the higher capacity APS MAF housing would be able to keep up, or a Speed Density tune would most likely be the only alternative. The E38 PCM has a hard limit of 12,200 Hz, which is the max value the MAF can report. Once this value has been exceeded, the MAF is considered to be "pegged" and the PCM does not know how much air is entering the motor. The larger MAF housing slows down the air signal and provides more range as the result. Either way, Howard was happy to make good use of EFILive, which he says is head and shoulders above any other tuning software for tuning the LS7s due to its "Virtual VE Table" and easy to read data logging features. For initial wide-open throttle tuning and testing of the kit, Redline would also be employing its brand new digital Dyno Dynamics DS450 and high-speed wideband O2. Further tuning would be done on the street, where the ZO6 feels most at home. Though the C6 still has a stock driveline save the RAM dual disc clutch, billet slave, and LG Motorsports carbon fiber driveshaft, we had also hoped to get some track times out of this beast-though the 3200-pound coupe would have little chance of hooking.
 ...seal the large 44mm TiAl...  ...seal the large 44mm TiAl wastegates to the downpipes. The filter and nipple must also be bolted to the wastegates prior to installation, and oriented properly, as it needs to connect to the turbo via a hose and spring clamps. |  After the turbo and manifold...  After the turbo and manifold have been bolted up to the downpipe and wastegate, the whole assembled piece is lifted up (from the bottom) and guided onto the studs already screwed into the heads. As the downpipe gets heavy with the turbo, wastegate, and manifolds bolted up, it helps to have three strong sets of hands. The passenger side goes in easier than the driver side. In fact, it is necessary to connect the O2 sensor on the driver side before putting this set of parts on the car. Note: only the front O2s are reused-the rear plugs can be used later for wideband O2s. |  Tech Bruce Hotaling torques...  Tech Bruce Hotaling torques the manifold bolts to 18 ft-lb. Since space is limited, the stainless steel turbo intake tube needs to be put in place before the manifolds are bolted up. This is also a good time to put in a set of NGK TR6s; Redline recommends a .030-inch gap. |
 Since oil is going against...  Since oil is going against gravity from the turbos back to the oil tank, it needs an electric motor to push it. The rubber hoses need to be clamped to the pump, and the pump needs to be clamped to the bracket prior to installation on the front cradle. A check valve ensures oil doesn't go back the other way, and the return to the oil tank feeds through a new cap. |  A distribution block and solenoid...  A distribution block and solenoid keep oil from draining into the turbos when the car is off. Howard says following along in the instructions, checking things off, and staying organized is the key to success. |  Twin in-tank Walbro fuel pumps...  Twin in-tank Walbro fuel pumps are supplied with the kit,... |
 ...which use -12 braided fuel...  ...which use -12 braided fuel lines and the stock feed line is recycled as the return line. An Aeromotive regulator controls the pressure, which is boost referenced to raise fuel pressure as boost is increased. It's a 1:1 ratio. |  High flow fuel rails and 60-pound,...  High flow fuel rails and 60-pound, high-impedance injectors come with the kit as well. A tuner kit, minus the fuel system upgrades, is also now available for $10,995 plus shipping. |  The electric oil pump bolts...  The electric oil pump bolts to the front cradle; it helps to unbolt the front swaybar for added clearance. |
 The twin bar and plate intercoolers...  The twin bar and plate intercoolers dwarf APS' C6 pieces, and mount on brackets sandwiched in between the frame and radiator cradle. Another difference between the C6 kit is that a larger [than stock] oil cooler is provided with the Z06 kit, which will mount in between the two intercoolers. |  Howard and Bruce test fit...  Howard and Bruce test fit the intercoolers, as they do most every part, prior to installation. |  The air intake tubes replace...  The air intake tubes replace the factory brake ducts, and are boxed for OEM look and clearance. Holes must be cut in the inner fenderwell to accommodate the pipes, which are secured by the upper A-arm bolt. For clearance, the brake lines and ABS sensors are unclipped. |