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2009 Nissan 370Z Sport Package - Stillen Intake, Exhaust, and Supercharger

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Baseline

Pros
The 370Z’s VQ37VHR 3.7L powerplant delivers 332 hp at 7,000 rpm and 270 lb-ft of torque at 5,200 rpm. These horsepower numbers were quite an improvement over the VQ35HR’s 306 hp and 268 lb-ft found in the previous version Z33 350Z thanks in part to its more technological VVEL and CVTC (Variable Valve Event and Lift, Continually Variable Timing Cam system), which improves engine response and delivers increased power under the curve. That, combined with an engine that has also been lowered by 0.6 inches to reduce the center of gravity, a shorter carbon-fiber driveshaft, along with a slew of weight saving features have helped contribute to the Z’s overall diet, which improved the 370Z’s performance.

Cons
The 370Z’s styling, particularly the new L-shaped headlamps and taillights, have conjured up mixed reviews as a love-it-or-hate-it feature, but regardless of its unique styling cues, most owners are generally happy with their Zs. If we had to be nitpicky with the vehicle we would point out its minor flaws like high oil temps during aggressive driving, excessive road noise, and the clutch in Manual.

Notes
As with any vehicle tested in 2NR, we performed routine maintenance, including an oil change and spark plug check/replacement, before strapping it onto the dyno. In stock trim, the 370Z delivered 276.4 whp and 227.5 lb-ft of torque.

Stillen Generation 3 Ultra Long Tube Dual Intake Kit

Parts
K&N air filters with T-bolt clamps, upper intake tubes, lower intake tubes, and silicone hose

Tools
10, 12, 14mm sockets/open-end wrenches, screwdrivers, pliers, and Dremel tool

Installation time
60 minutes

Pros
Stillen engineers introduced the Gen 3 intake design with optimized tubing lengths, diameters, minimal turns, and ideal placement to provide maximum airflow. The Gen 3 intake’s unique design places two large K&N filters in front of the radiator. The placement of these filters allows for optimum cold airflow and easy filter removal for cleaning. The kit features polished aluminum tubes that pass through the front core support and larger air filters than the previous Stillen Gen 2 intake system and is 50-state smog/CARB legal.

Cons
Installation of the intake can be time consuming, requiring removal of the radiator shroud, front bumper cover, and brace. The Stillen intake also requires enlarging the OE core support to fit the larger-sized pipes.

Notes
The Stillen Gen 3 intake system uses longer tuned intake runner lengths and MAF sensor positioning to provide more flow as well as tricking the ECU into making more power by delivering a leaner 12.5:1 air/fuel ratio compared to the pig rich stock air/fuel ratio of 11.5:1. Dyno testing the 370Z with intake revealed an increase in power and torque throughout the powerband, with peak gains of 16.3 hp and 7.2 lb-ft of torque. The long-tube intake made an impressive 15 hp and 13 lb-ft of torque at 7,200 rpm over our previous run, with plenty of gains in the midrange to top end, from 3,800 rpm to redline.

Stillen 370Z Dual Exhaust System

Parts
Stillen cat-back exhaust system, exhaust gaskets, clamps, and flange bolts and nuts

Tools
10, 12, 14, and 17mm sockets, 10, 12, 14, and 17mm open-end wrenches, ratchet, extension, crescent wrench, and WD-40

Installation time
160 minutes

Pros
Stillen’s stainless steel exhaust system adds performance and style. It’s constructed out of polished stainless steel and produces a deep and crisp sound while generating more horsepower and torque. The exhaust is finished with dual 4.5-inch polished 304 stainless tips and polished mufflers and comes with a lifetime warranty.

Cons
Due to the Stillen exhaust’s three-piece design, we suggest asking for assistance to help speed up the installation process.

Notes
Dyno testing the exhaust revealed an increase in power and torque throughout the powerband, with peak gains of 1.7 hp and 7.9 lb-ft of torque. Although peak horsepower gains were minimal, the exhaust made 13 hp and 10 lb-ft of torque at 6,000 rpm over our previous run, with plenty of gains in the midrange to top end. The Stillen exhaust’s larger diameter piping helped reduce backpressure and increase exhaust flow for greater peak power and a broader torque band, which paved the way for our Supercharger kit.

Stillen CARB legal Supercharger Kit

Parts
Vortech V-3 Centrifugal supercharger kit, air intake with a polished air charge pipe and genuine K&N intake filters, 600cc fuel injectors, high-output fuel pump, air-to-water intercooler, and UpRev ECU tuning cable and software

Tools
1 bottle (4 ounces) Vortech supercharger lubricant, ½, 9⁄16-inch open-end wrenches, 3⁄16-inch Allen wrench, screwdrivers, 10mm socket, and ratchet

Installation Time
10 to 12 hours

Pros
Stillen’s Supercharger kit is considered one of the most comprehensive kits sold on the market today. Unlike many supercharger kits that require dealer installation, Stillen designed this kit to be an easy install. The Vortech charged kit comes with detailed step-by-step instructions, including a full engine warranty from the manufacturer. The bolt-on kit offers a significant increase from the factory rated 332hp output while maintaining street-legal status with 50-state/CARB legality.

Cons
Installing the Supercharger kit was a straightforward process, considering it was a bolt-on kit with all necessary mounting and hardware components included. As with any aftermarket supercharger kit, we recommend having an experienced mechanic install and re-flash your ECU following its installation: failure to do so could be catastrophic. The Supercharger kit comes with its own dual charge pipes, which require removal of any aftermarket intake prior to installation—including our Gen 3 long-tube kit we had previously installed.

Notes
Once the supercharger kit was installed and the ECU re-flashed, the engine’s true potential began to materialize. Our final dyno run showed a healthy peak gain of 121.7 hp and 75.8 lb-ft of torque and 140 hp and 85 lb-ft of torque at 7,300 rpm over our previous run, with plenty of gains in the midrange to top end.

Conclusion

Three bolt-on parts, along with the UpRev ECU re-flash, improved the engine’s output by 139.7 hp and 90.8 lb-ft of torque over our baseline numbers, as our 370Z now delivers an impressive 416.1 whp and 318.3 lb-ft of torque. Dyno testing of the 370Z and its venerable VQ37VHR this month barely scratches the surface of the true potential of this combination. We plan to take this platform to the next level in the months to come.

Conclusion HP +HP TQ +TQ
Baseline 276.4 - 227.5 -
Stillen Gen 3 Intake 292.7 16.3 234.7 7.2
Stillen Dual Exhaust 294.4 1.7 242.6 7.9
Stillen Supercharger 416.1 121.7 318.3 75.7
Final 416.1 139.7 318.3 90.8

Bankroll
Stillen Gen 3 Intake$525.79
Stillen Dual Exhaust$1,269.61
Stillen Supercharger (Satin finish)$ 6,299.00
Total$8,094.40

HOTBOX
Stillen
3176 Aiirway Ave
Costa Mesa
CA  92626
800-891-1058
www.stillen.com
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1 comments
bobjones2007
bobjones2007

WTF. Why spend $525 on a Gen3 intake only to remove it again. Especially since 2NR already dyno-tested the Gen3 in an earlier article. smh

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