Introduction

The Skunk2 J35 Exhaust System is a popular upgrade for enthusiasts seeking to enhance both the sound and performance of their vehicle. Designed for J35-powered platforms such as the Honda Accord V6, Acura TL, and MDX, this cat-back system delivers a deeper, more aggressive tone while freeing up restrictive factory components. Proper installation is critical to ensure a leak-free fit and to take full advantage of the gains in horsepower and torque. This guide provides a detailed, step-by-step process, along with professional tips and best practices for a seamless install. Whether you’re an experienced DIYer or a first-time installer, these instructions will help you get the job done right.

Tools and Materials Needed

Before lifting the vehicle, gather all necessary tools and materials. Having everything on hand saves time and reduces frustration.

  • Skunk2 J35 Exhaust System (cat-back kit with hardware)
  • Socket wrench set with metric sockets (8mm, 10mm, 12mm, 14mm, 17mm)
  • Torque wrench (ft-lb range)
  • Breaker bar (for stubborn bolts)
  • Floor jack and four jack stands (use stands rated for your vehicle’s weight)
  • Penetrating oil (e.g., PB Blaster or WD-40 Specialist)
  • Safety goggles and heavy-duty gloves
  • Shop towels or rags
  • Rust penetrant and wire brush (for corroded hardware)
  • Optional: exhaust hanger removal tool, impact gun, silicone sealer (for extra leak protection)

Preparation and Safety

Begin by parking the vehicle on a level, concrete surface. Ensure the engine is completely cool to avoid burns from hot exhaust components. Engage the parking brake and chock the front wheels. Put on safety goggles and gloves before proceeding. Disconnect the negative battery terminal to prevent accidental electrical shorts (though not required, it’s a good practice when working near sensitive components).

If your vehicle has been driven recently, allow at least one hour for the exhaust to cool. For added safety, work in a well-ventilated area to avoid exhaust fumes during the removal process. Never rely solely on a jack – always use jack stands.

Step 1: Lift the Vehicle

Position the floor jack under the vehicle’s rear differential or subframe (consult your owner’s manual for the correct jacking point). Raise the rear of the vehicle until the wheels are off the ground, then place jack stands under the designated support points. Lower the jack onto the stands and give the vehicle a gentle shake to ensure stability. For more working room, you can also lift the entire car, but the rear is sufficient for this exhaust installation.

Step 2: Remove the Stock Exhaust System

2a. Locate and Disconnect the Exhaust Flange

Crawl under the vehicle and locate the flanged connection between the stock exhaust and the catalytic converter (or downpipe). These bolts are often seized due to heat cycling. Apply penetrating oil generously to each bolt and wait 5–10 minutes. Use a breaker bar or socket wrench with a 14mm socket to loosen the nuts. If they are stubborn, tap the ends gently with a hammer to break the corrosion. Once loose, remove the nuts completely.

2b. Unhook the Rubber Hangers

Identify the rubber hangers that support the stock exhaust along its length. Typically there are three to four hangers. Using a flathead screwdriver or an exhaust hanger removal tool, pry the exhaust hangers off the mounting posts. Work carefully to avoid tearing the rubber. You can also use dish soap or silicone spray to lubricate the hangers for easier removal.

2c. Lower the Stock Exhaust

With all hangers and the flange disconnected, the stock exhaust assembly can be lowered. Support the rear section with one hand while pulling the front section free. The system may be heavy (often 25–40 lbs), so use caution. Slide the exhaust out from under the car. Set it aside or recycle it. Inspect the flange gasket – if it is damaged, replace it; the Skunk2 kit may include a new gasket, but have one on hand.

Step 3: Install the Skunk2 J35 Exhaust System

3a. Prepare the Flange Connection

Wipe the catalytic converter flange clean using a rag. Apply a thin layer of anti-seize compound to the flange bolts to prevent future seizing – this is especially important in winter climates where salt accelerates corrosion. Place the supplied gasket (or a new OEM-quality gasket) onto the flange, aligning the holes.

3b. Position the Skunk2 Mid-Pipe and Axle-Back Sections

Slide the Skunk2 mid-pipe section under the vehicle and attach it to the catalytic converter flange. Hand-tighten the two flange nuts (typically 12mm or 14mm). Do not fully torque at this point. Next, loosely attach the axle-back (muffler) section to the mid-pipe using the supplied slip-fit clamp or V-band. Adjust the entire assembly so that it aligns with the factory hanger locations. Have an assistant hold the muffler in place while you attach the rubber hangers to the new exhaust’s mounting posts.

3c. Tighten All Fasteners

Once the exhaust is positioned and all hangers are secure, begin tightening from the front to the back. Use a torque wrench to tighten the flange nuts to the manufacturer’s specification – typically 30–40 ft-lb for M10 or M12 fasteners. Refer to the Skunk2 instruction sheet for exact values. For slip-fit clamps, tighten the bolts evenly to avoid distorting the pipe. A good rule is 35–45 ft-lb for a 2.5-inch or 3-inch clamp. Avoid overtightening, which can strip threads or crack a flange.

Step 4: Final Alignment and Check

Before lowering the vehicle, perform a thorough alignment check. Ensure the muffler tip is centered in the rear bumper cut-out and that the exhaust does not contact the underbody, heat shields, or suspension components. Clearance is critical – if the pipe touches the frame, it will cause rattling and vibration. Adjust by loosening the clamps and repositioning the sections. Once aligned, apply final torque to all clamp bolts. Re-check the hangers to ensure they are fully seated and not twisted.

Step 5: Lower the Vehicle and Test

Remove the jack stands and lower the vehicle to the ground. Reconnect the negative battery terminal. Start the engine and let it idle. Listen for any hissing or tapping sounds – these indicate exhaust leaks at flange or clamp connections. Walk to the back of the car and feel for air pulses at each joint using your hand (be careful of hot pipes). If you hear or feel a leak, tighten the relevant fastener further. After a few minutes of idling, rev the engine gently to clear condensation and confirm the tone. The Skunk2 system should produce a deep, refined note with no rasp or drone at idle.

Sound and Performance Expectations

The Skunk2 J35 exhaust is designed to reduce backpressure and improve exhaust flow, which can net 5–12 horsepower on a stock engine, depending on the vehicle and other mods. The sound is markedly deeper and more aggressive than stock, with a subtle growl under hard acceleration. At highway speeds, cabin drone is minimal thanks to Skunk2’s resonator and muffler tuning. For maximum performance, pairing this system with a cold-air intake and a tune can unlock additional gains. Note that some local jurisdictions have noise ordinances – check your area’s regulations before installation.

Maintenance and Long-Term Tips

  • After the first 500 miles, re-torque all flange and clamp bolts as the gaskets and materials settle.
  • Periodically inspect rubber hangers for cracks or softening. Replace them every 2–3 years to avoid drooping.
  • If you live in a region with road salt, apply a high-temperature anti-seize to exposed bolts annually.
  • Clean the muffler tips with a mild cleaner and non-abrasive cloth to maintain appearance.
  • Never use steel wool on polished stainless steel; it can cause micro-scratches and lead to rust.

Conclusion

Installing the Skunk2 J35 Exhaust System is a rewarding project that yields a noticeable improvement in both sound and performance. By following this step-by-step guide and paying attention to torque specs and alignment, you’ll ensure a leak-free, professional-grade installation. The system is built to last, delivering years of enjoyment. For additional support, consult the official Skunk2 website or chat with fellow enthusiasts on forums like AccordForum or AcuraZine for tips and dyno results. Now get out there and enjoy the new soundtrack of your ride.