Kristian Grimsland
Associate Editor, Muscle Mustangs & Fast Fords
January 31, 2014

Nitrous! It packs a punch, delivers incredible performance gains, and can dramatically drop your dragstrip times. Aside from its over-glamorized use in Hollywood films, offering mythical power at the press of a button, it's a simple design that works.

When injecting nitrous into your engine, you're essentially adding more oxygen into the combustion chamber. Due to the added oxygen, more fuel is needed in order to maintain a proper air-to-fuel ratio. With the increased air and fuel, the combustion process is enhanced and an increase of power is the result.

There are two types of nitrous applications—dry and wet. In a dry system, only nitrous flows into the intake tract; the extra fuel is added by increasing fuel pressure or adjusting how long the fuel injectors stay open (increasing the pulse width). In a wet kit, both nitrous and fuel are delivered together, typically through a plate or nozzle system.

When we got wind of Blow-By Racing's new Reaper Nitrous H/K (hidden kit) dry system, we were intrigued. Designed to be totally hidden for '10-present Mustangs, BBR's dry-nitrous kit offers versatility for just about anyone. Included in the kit (PN Reaper-HK-25) is a NX 21⁄2-pound bottle, NX solenoid, stainless steel fittings, a nylon nitrous line, wide-open throttle (WOT) switch, and momentary pushbutton and activation switch. Whether you're the casual street hooligan or a track racer in need of a pick-me-up, this kit offers an increase up to 125 hp at a reasonable cost—$395.95.

"We wanted to design a kit that was totally hidden and something that hasn't been done before," says Chris Jones, owner of Blow-By Racing. "For '11-and-up cars, the sound tube gave us a perfect hiding spot for the nitrous line. We teamed up with Nitrous Express to build the kit, as we believe it offers the best quality in parts and customer service.

"Our kit was originally designed to handle between 50 to 125 horsepower out of the box, but with a solenoid and bottle upgrade, it can easily support over 250. Our kit is simple, easy to install, and offers a cost-effective way for anyone looking to improve performance."

We headed to Boca Raton, Florida, where BBR installed its kit onto a bolt-on automatic '13 Mustang GT. Our test mule featured a stock 3.15 gear ratio, JLT CAI, BBR off-road X-style mid-pipe, a tune, and Nitto NT05R 285/40R18 drag radials. It had run a best of 12.50 at 114 mph. On the dyno, it cranked out 388 rwhp and 336 lb-ft of torque. With nitrous, it laid down 485 rwhp and 488 lb-ft. That's an increase of 97 rwhp and 152 lb-ft of torque.

Installation of the Reaper kit took less than two hours; we then headed to Palm Beach International Raceway for testing. We ran several times throughout the night, with a best of 10.83 at 126.53 mph. That's a drop of 1.67 seconds in the quarter. We bet that would surprise your friends, especially considering no one will know you're spraying the juice.

1 If you’re looking for a stealthy nitrous kit, the Reaper kit utilizes the Coyote engines sound tube for placement of the nylon nitrous line. To begin, BBR technician Rob Vargo removed the tube.
2 Once removed, Rob used a pick to puncture a hole through the diaphragm of the sound tube.
3 Very carefully, he fished the nylon nitrous line through.
4 Using a stepped drill bit, he then drilled a hole through the supplied vacuum cap.
5a Next he inserted the nitrous push-lock fitting and nozzle onto the cap.
5b
6a Rob then installed the sound tube back into place and secured the new nitrous line using a worm-gear hose clamp to the cold-air intake.
7 It’s just a bolt-on Coyote. What nitrous?
8 Rob ran the nitrous line through the firewall, up through the underside of the dash, and to the glovebox.
9a Included in the kit are two Velcro straps. Rob drilled two 3/8-inch holes into the glovebox to mount the straps for the 2½-pound nitrous bottle.
9b
10a He then installed the push-lock fitting onto the solenoid and attached the nitrous line. The solenoid is designed to mount directly to the bottle.
10b
11 Here’s what the bottle looks like installed. You can even keep your owners manual in the glovebox. At eye level, you can’t even tell it’s there. How’s that for stealthy?
12a Rob then wired the solenoid to the arming switch using 14-gauge wire. We choose to mount the arming switch in the center console for a discreet look.
12b
13a Included in the kit is a momentary pushbutton and wide-open throttle switch. It’s up to the user to decide which activation method to use. We opted for the WOT switch. Here, Rob installed the switch to the gas pedal, wiring it to the arming switch.
13b
14a In naturally aspirated trim, our ’13 Mustang GT laid down 388 rwhp and 336 lb-ft of torque. After the install, it cranked out 485 rwhp and 488 lb-ft of torque. That’s an increase of 97 rwhp and 152 lb-ft.
14b
15 With the install finished and power output greatly increased, we headed to Palm Breach International Raceway. Previously, it ran a best of 12.50 at 114 mph with bolt-ons. Now with a 125 shot of nitrous, it ran 10.83 at 126.53 mph. We dropped 1.67 seconds and picked up over 10 mph.