The Lingenfelter Performance Engineering (LPE) GTO Performance air intake for the '05-'06 GTO consists of an air-filter assembly and filter housing that includes an S&B cotton-gauze, washable air filter. It replaces the factory airbox with a custom-manufactured airbox that was designed to form-fit into the old airbox location. Rubber seals on the bottom and top of the box seal out transient heat from the engine, allowing the intake to pull cool, dense air from behind the grille and core support.
An Auto Specialties Performance (ASP) harmonic-balancer underdrive pulley replaces the factory harmonic-balancer pulley and slows down the accessory drive by 25 percent, reducing parasitic drag. The ASP pulley is constructed of aluminum and is SFI rated.
NGK TR-6 V-Power spark plugs feature a patented V-groove center electrode that forces the spark to the outer edge of the ground electrode, placing it closer to the air/fuel mixture.
 The Lingenfelter Performance...  The Lingenfelter Performance Engineering (LPE) GTO Performance air intake for the '05-'06 GTO will keep hot underhood air out of the rubber-sealed box, letting in only cool air from behind the grille and core support areas to make more power. |  An Auto Specialties Performance...  An Auto Specialties Performance harmonic-balancer (25 percent) underdrive pulley is installed with a new GM balancer bolt and two new Gates belts for the power-steering/alternator and air-conditioning unit. |  NGK TR-6 V-Power spark plugs...  NGK TR-6 V-Power spark plugs that are one heat range cooler than stock plugs (NGK TR-55) are installed after being gapped to the factory specification of 0.040. |
MSD 8.5mm Super-Conductor spark-plug wires are available in red or black and feature dual-crimp terminals and factory-style plug boots. The 8.5mm jacket is constructed of silicone and proprietary synthetic materials to protect against high heat and abrasion.
GTO Power Package Options
• HPE's Custom Throttle Body Porting Service ($150) reworks the GM 90mm casting to remove the machined-in leading edge, allowing for a smoother transition of air into and out of the throttle body. The porting service is available for all LS-series throttle bodies, and all work is done in-house.
• Hypertech's 160-degree PowerStat (PN LS2-160, Retail $35.18) thermostat combined with custom programming of the GTO's fans improves performance by allowing the engine to run cooler, thereby reducing the chances of detonation under load, which can damage components.
• HPE's Custom Dyno Tuning ($425) ensures maximum safe horsepower. The company uses LS2edit for '05-'06 GTOs, as well as a Dynojet Model 248 dyno and a Mustang MD-1750 in-ground dyno for tuning purposes.
• GTO Package Installation (PN, LBR, Retail $1,100). Professional installation of the GTO Package is highly recommended and should be completed by a mechanic who has the knowledge and specialty tools necessary to perform major LS-series engine work, such as camshaft and valvespring replacements. Labor generally takes 12-14 hours depending on the level of options chosen.
GTO Nitrous Package
HPE's GTO Nitrous package retails for $650 and fits the '05 and '06 GTO. It features a kit made by Cold Fusion Nitrous of Houston, and it contains a wet-plate system designed for the LS2. Cold Fusion was founded by Mike Wear in 1995 as a nitrous manufacturing company that supplied solenoids and all manner of nitrous parts to many of the large retail-based companies. After 5 years, Cold Fusion began selling retail, manufacturing all of its products in the United States.
The Cold Fusion Nitrous LS2 Plate kit features a 90mm, billet 6061-aluminum plate that mounts to the LS2 throttle body, N2O and fuel Super Power solenoids, a 10-pound bottle with a high-flow valve and liquid-filled pressure gauge, and all necessary accessories such as braided stainless steel lines, wiring, and a throttle-activated window switch.
 A Ferro-Magnetic impregnated...  A Ferro-Magnetic impregnated center core and helically wound copper-alloy conductor in the MSD 8.5mm Super-Conductor spark-plug wires provide low resistance to maximize spark energy and reliable protection from electromagnetic interference. |  HPE says its throttle-body...  HPE says its throttle-body porting is good for typical gains of 7-10 rwhp. |  The Cold Fusion Nitrous LS2...  The Cold Fusion Nitrous LS2 Plate kit features a 90mm, billet 6061-aluminum plate that mounts to the LS2 throttle body and is adjustable from 100 to 250 hp. It also includes everything necessary to install it. |
Nitrous Package Options
Although the GTO Nitrous Package lists as a kit, the following options are commonly added by customers when ordering a nitrous system. On the subject '06 GTO, each of these options was chosen except the bottle-heater pressure switch.
• Cold Fusion Remote Bottle Opener (PN CFN-117C, Retail $199.95). Since the valves on nitrous bottles should not be left open, invariably an owner has to pull over to the side of the road, pop the trunk, and open the nitrous valve. The Cold Fusion remote bottle opener allows the owner to open and close the nitrous bottle from the driver seat. Made of billet aluminum and featuring an advanced servo-powered motor, the bottle opener fits all standard-size nitrous bottles including 5, 10, 15, and 20-pound units. Integral to the design is a quick-release mechanism that allows the valve to be removed for bottle filling. Included in the bottle opener are plug-and-play connectors and a switch.
• Cold Fusion Purge Kit (PN CFN-1700, Retail $89.95). For consistency and the most power, any nitrous vapor in the lines should be removed, allowing the liquid N2O to be available to the nitrous solenoid for instant power. The Cold Fusion 4AN purge kit comes with an electric solenoid, a 4AN adapter fitting, a 11/48-inch hex nipple, and both fittings for the inlet and outlet with 28-inch 11/44 poly line.