Why Upgrade to a Cold Air Intake?

The factory air intake system on the Porsche Boxster is designed for quiet operation and cost efficiency, but it also creates significant restrictions. A cold air intake replaces the restrictive factory airbox and snorkel assembly with a low-restriction intake tube and a high-flow air filter. By drawing cooler, denser air from outside the engine bay, the Perrin cold air intake improves the air-fuel mixture density, leading to more complete combustion. The result is a measurable increase in horsepower and torque across the rev range, sharper throttle response, and a more engaging intake sound.

Modern Porsche engines, especially the M96 and M97 variants found in the 986 and 987 Boxster, respond particularly well to improved intake flow. The Perrin kit is designed specifically for these platforms, ensuring a precise fit and optimized airflow path. Key benefits include:

  • Increased horsepower: Aftermarket cold air intakes typically add 10–15 horsepower at the wheels on a stock Boxster, with peak gains often appearing in the mid-to-high RPM range.
  • Improved throttle response: Reduced intake restriction allows the engine to rev more freely and respond more quickly to throttle inputs.
  • Enhanced efficiency: Better airflow can slightly improve fuel economy under normal driving conditions, though aggressive driving will consume more fuel.
  • Weight reduction: The Perrin intake is significantly lighter than the factory plastic and metal airbox assembly, contributing to a minor overall weight savings.
  • Aggressive sound: The exposed cone filter and smooth intake tube amplify the induction noise, giving the flat-six a deeper, sportier roar under acceleration.

Tools and Materials Needed

Before beginning the installation, gather all necessary tools and components. Having everything on hand will prevent delays and ensure a smooth process.

Required Tools

  • Socket wrench set: 8mm, 10mm, 11mm, and 13mm sockets (Torx bits if your Boxster uses T20 or T25 fasteners)
  • Flathead screwdriver (for prying clips and releasing wiring harness retainers)
  • Phillips screwdriver (for hose clamps if not using a socket)
  • Torque wrench (for tightening clamps to spec – optional but recommended)
  • Long-nose pliers (for removing spring clamps)
  • Shop towels or rags (to clean the work area and prevent debris entry)
  • Gloves (to protect hands from sharp edges and grease)
  • Flashlight or work light (to illuminate the engine bay)

Parts Included in the Perrin Kit

  • Aluminum or composite intake tube
  • High-flow dry or oiled cone filter (check your specific kit)
  • Silicone couplers and hose clamps
  • Heat shield (on most Boxster-specific kits)
  • Mounting brackets and hardware
  • Detailed instruction manual
  • Ram-air scoop or duct: Some owners add a duct to direct cool air directly to the filter area for extra gains.
  • MAF sensor cleaner: If your MAF sensor is dirty, clean it before reinstallation.
  • Replacement foam filter oil: For oiled-type filters, have filter oil on hand if you plan to pre-oil a new element.

Step-by-Step Installation Guide

Step 1: Preparation and Safety

Park the Porsche Boxster on a level surface and allow the engine to cool completely. A hot engine increases the risk of burns and makes rubber hoses more difficult to work with. Disconnect the negative terminal of the battery using a 10mm socket. This prevents accidental short circuits, airbag deployment, or damage to the ECU during sensor disconnection. Remove the engine cover – on the 986 and 987 models, this is a plastic panel held by several 8mm bolts or clips.

Step 2: Remove the Stock Intake System

The factory intake assembly consists of several components: the airbox (with filter), the intake snorkel (which reaches down into the bumper area), and the mass airflow (MAF) sensor housing. Follow these steps:

  1. Unplug the MAF sensor connector by pressing the release tab and pulling straight back. Do not yank on the wiring.
  2. Loosen the clamp that secures the intake tube to the throttle body. Use a flathead screwdriver or 8mm socket.
  3. Remove the snorkel from the body panel by releasing any clips or screws. On many Boxster models, the snorkel is attached at the front of the engine bay with two screws and a rubber grommet.
  4. Unbolt the airbox from its mounting bracket. Typically, this requires a 10mm socket. There may be one bolt on the side and another underneath.
  5. Carefully lift the entire stock assembly out. Note the orientation of any rubber grommets or seal rings; you may reuse them if specified in the Perrin instructions.

Set the factory parts aside in case you ever wish to revert to stock. Inspect the throttle body opening – use a shop towel to remove any debris or oil residue that may have accumulated.

Step 3: Install the Perrin Cold Air Intake

Open the Perrin kit and lay out all components. Identify the main intake tube, couplers, and filter. Most Perrin Boxster kits include a heat shield that mounts in the stock airbox location.

  1. Mount the heat shield: Position the shield in the engine bay aligning with the factory bolt holes. Secure it with the provided hardware. Tighten to 8–10 Nm (use a torque wrench if available).
  2. Install the silicone coupler on the throttle body: Slide one of the provided couplers over the throttle body inlet. Do not tighten yet. Ensure the coupler is fully seated onto the throttle body lip.
  3. Attach the intake tube: Slide the Perrin intake tube into the coupler on the throttle body. Rotate the tube so that the MAF sensor flange faces an accessible position. Tighten the coupler clamp evenly with a screwdriver or socket to 4–5 Nm.
  4. Transfer the MAF sensor: Carefully remove the MAF sensor from the factory housing using a Torx T20 or T25 driver (two screws). Gently extract the sensor without touching the sensing element. Install it into the Perrin tube flange, ensuring the orientation arrow points in the direction of airflow (usually toward the engine). Tighten screws to 2–3 Nm.
  5. Connect the intake tube to the filter: The kit will have a coupler or reducer to attach the open end of the tube to the cone filter. Slide the filter onto the tube and tighten the clamp. If using a metal tube, a flexible silicone coupler may be needed. Ensure the filter is oriented so it pulls air from the coolest region (behind the heat shield).
  6. Secure the intake tube: Use the supplied bracket to support the intake tube. Many kits include a bracket that bolts to an existing stud on the engine or chassis. This prevents vibration and strain on the couplers.
  7. Check all clamps: Go back and verify that every clamp is tight. Pay special attention to the MAF sensor connection, throttle body coupler, and filter clamp.

Step 4: Reconnect Sensors and Final Checks

  • Reconnect the MAF sensor electrical connector. Listen for a click to confirm it's fully seated.
  • Tuck any loose wiring away from moving parts (belts, pulleys) and heat sources (exhaust headers).
  • Reinstall the engine cover if it does not interfere with the new intake. Some aftermarket intakes require the cover to remain off for clearance; check Perrin's instructions.
  • Reconnect the negative battery terminal. Tighten securely.

Step 5: Test and Validate Operation

Start the engine. It may run a bit roughly for the first few seconds as the ECU adapts to the new airflow. Let it idle for 2–3 minutes. Listen for any air leaks – a hissing or whistling sound indicates a loose clamp. Also inspect for any contact between the intake tube and engine components. If necessary, adjust the tube position. Shut off the engine. After 30 seconds, restart and check again. Perform a visual inspection of all connections. Finally, take the Boxster for a short test drive under moderate throttle. Pay attention to the throttle response and engine sound. No check engine light should appear – if it does, verify the MAF sensor is correctly plugged in and the intake tube is not torn.

Expected Gains from Installation

Dyno tests on the 2.7L and 3.2L Boxster engines show that a well-designed cold air intake like the Perrin typically produces the following gains over a stock system:

  • Peak horsepower increase: 10–15 hp at the wheels (approx. 8–12% improvement). Gains are most noticeable above 4500 RPM and continue to redline.
  • Peak torque improvement: 8–12 lb-ft at the wheels, with a broader torque curve from 3000–5500 RPM.
  • Throttle response: Measurably faster pedal response – the engine feels livelier from a stop.
  • Sound: A louder, more aggressive induction roar under hard acceleration, with a subdued tone at cruising speeds (depending on heat shield quality).
  • Fuel economy: Under normal driving, a slight improvement (1–2 MPG) is possible due to reduced pumping losses, but real-world gains vary.

Note: Actual gains depend on the specific Boxster model year, engine displacement, and condition of the engine. A well-maintained 3.2L S engine will see the higher end of the gains. For maximum benefit, consider pairing the intake with a performance tune (ECU remap) and a less restrictive exhaust. Many owners report that the combination of intake + tune yields an additional 15–20 hp over the intake alone.

Long-Term Maintenance and Care

To keep your Perrin cold air intake performing at its best, follow these maintenance guidelines:

  • Filter cleaning: For oiled cotton/gauze filters, clean and re-oil every 10,000–15,000 miles (or more frequently in dusty environments). Dry-type filters can be cleaned with compressed air or a vacuum, but replace them per the manufacturer's recommendation.
  • Inspect clamps: Every oil change, check that all clamps are still tight. Vibration can loosen them over time.
  • Check for leaks: Look for any cracks in the silicone couplers or intake tube. Replace if damaged.
  • MAF sensor cleaning: A dirty MAF can cause poor idling and reduced power. Use a specialized MAF cleaner (e.g., CRC) every 20,000 miles. Never touch the sensor element.
  • Heat shield seal: Ensure the heat shield remains properly sealed against the engine bay to prevent hot air from being drawn in. Replace any foam gaskets that deteriorate.

Common Questions and Considerations

Will a Cold Air Intake Void My Porsche Warranty?

In the United States, the Magnuson-Moss Warranty Act protects consumers: the manufacturer must prove that a specific aftermarket part caused a failure to deny warranty coverage. However, Porsche dealerships may be reluctant to approve warranty claims on components directly affected by the intake (e.g., MAF sensor issues). For peace of mind, keep the original parts for reinstallation before dealer visits.

Is Tuning Required After Installation?

No. The Perrin intake is designed to work with the factory ECU without a tune. The MAF sensor compensates for the increased airflow within the stock fuel trims. However, for maximum power gains, a professional ECU tune is highly recommended. A tune adjusts fuel mapping and ignition timing to take full advantage of the improved airflow.

Does the Intake Require Any Drilling or Modifications?

The Perrin kit is a direct bolt-on for most Boxster models. No cutting, drilling, or permanent modifications are needed. However, some heat shields may require removing one or two existing screws and replacing them with provided hardware.

Will It Pass Emissions?

A cold air intake by itself typically does not cause emissions test failures, as long as the MAF sensor is functioning and the engine runs correctly. However, some states (e.g., California) require an EO (Executive Order) number for intake systems. Check your local regulations before installing if you live in a strict emissions region.

Conclusion

Installing a Perrin Cold Air Intake on your Porsche Boxster is a rewarding upgrade that delivers a tangible performance improvement. The process is straightforward and can be completed in about an hour with basic hand tools. The gains – up to 15 horsepower, improved torque, and a thrilling intake note – transform the character of the flat-six engine. Pair it with a quality exhaust and a tune for maximum effect, and you'll enjoy a Boxster that feels more responsive and exciting on every drive. For more information on the specific kit for your model, visit the Perrin Performance official site. For community tips and installation photos, check the Planet-9 Boxster forum and Rennlist.