Table of Contents
Tools and Materials Needed
Before beginning any exhaust installation, gathering the correct tools and parts is critical. For the Toda Racing exhaust system on a J35 engine, you’ll need the following:
- Toda Racing exhaust system (confirmed model for your specific J35 vehicle, such as the Honda Accord, Pilot, or Acura TL)
- Metric socket set (10mm, 12mm, 14mm, 17mm sockets commonly used)
- Combination wrench set (same sizes as sockets)
- Torque wrench (capable of 20-50 ft-lb range)
- Floor jack and two jack stands (rated for your vehicle’s weight)
- Safety glasses and mechanic’s gloves
- Penetrating oil (such as WD-40 Specialist or PB Blaster)
- Shop towels or rags
- Optional but helpful: Exhaust hanger removal pliers, anti-seize compound, thread locker (medium strength), and a rubber mallet.
Preparation Steps
Proper preparation prevents common headaches like stripped bolts or exhaust leaks. Follow this sequence carefully:
- Park on a level surface and engage the parking brake.
- Disconnect the negative battery terminal to avoid accidental electrical shorts and to reset the ECU after installation.
- Raise the vehicle using a floor jack at the manufacturer-recommended lifting points, then place jack stands under the frame rails or subframe. Lower the car onto the stands so it is stable. Never work under a vehicle supported only by a jack.
- Apply penetrating oil to all exhaust fasteners you will remove — manifold-to-cat bolts, mid-pipe connections, and muffler hangers. Allow the oil to soak for 5–10 minutes while you prepare other items.
- Lay out the Toda Racing exhaust components and verify you have all gaskets, bolts, and hardware. Compare the new system with your old one to confirm fitment.
Removing the Factory Exhaust System
The J35 exhaust routing varies slightly between chassis, but the removal procedure follows the same logic. Work from the front of the car backward.
Step 1: Remove the catalytic converter / downpipe assembly
- Locate the nuts or bolts securing the catalytic converter to the exhaust manifold (usually two or three studs). Use a 14mm socket and wrench.
- If bolts are stubborn, apply more penetrating oil and wait another minute. Tap with a hammer gently to break rust.
- Support the catalytic converter section with a jack or a helper, then unbolt the rear flange where it meets the mid-pipe (often two bolts). Lower the front section and set it aside.
Step 2: Remove the mid-pipe (resonator section)
- Unbolt the mid-pipe from the rear section of the catalytic converter (if not already separated) or from a second flange.
- Remove the rubber exhaust hangers using pliers or a flathead screwdriver. Pull the hanger rod out of the rubber isolator; a bit of soapy water or silicone spray helps.
- Slide the mid-pipe out from under the car.
Step 3: Remove the rear (axle-back) section
- Unbolt the muffler from the mid-pipe flange (often two bolts).
- Remove the two or three rubber hangers securing the muffler. Work the muffler off the hanger posts with pliers.
- Lower the rear section and remove it. This part can be heavy — have a helper support it if needed.
Step 4: Clean the mating flanges
Before installing the Toda Racing system, use a wire brush or sandpaper to clean the flange surfaces on the exhaust manifold and catalytic converter (if retaining). Remove all old gasket material and rust. A clean surface ensures a leak-free seal.
Installing the Toda Racing Exhaust System
Toda Racing exhausts for J35 engines are typically mandrel-bent stainless steel with precision flanges. Follow the installation sequence: rear to front, loosely fitting all components before final tightening.
Step 1: Install the rear section (muffler / axle-back)
- Attach the new Toda Racing muffler to the rubber hangers. Push the hanger rods into the isolators; a small amount of dish soap or silicone lubricant makes this easier.
- Hand-tighten the bolts connecting the muffler to the mid-pipe section. Use the provided gasket between flanges. Do not fully tighten yet.
Step 2: Install the mid-pipe (if separate)
- Slide the mid-pipe into position, connecting it to the catalytic converter or downpipe flange (again with a new gasket).
- Attach the mid-pipe to the rear section’s flange. Hand-tighten bolts.
- Reinstall rubber hangers that support the mid-pipe. Ensure the pipe is not contacting the chassis or suspension components.
Step 3: Connect the front section (if applicable)
Some Toda Racing systems include a replacement front pipe or test pipe that eliminates the catalytic converter. If you are using such a system, install it now:
- Bolt the front pipe to the exhaust manifold studs using new locking nuts or the supplied hardware. Do not reuse old hardware — it may stretch or corrode.
- Connect the front pipe to the mid-pipe flange.
Step 4: Align the entire system
With all bolts hand-tight, check that the exhaust tips are centered in the bumper cutout and that no section is under tension. Adjust by shifting the flanges or tapping the hangers with a rubber mallet. Misalignment causes vibration, rattling, and premature gasket failure.
Tightening and Final Adjustments
Use your torque wrench to tighten all fasteners to the values in the table below. Overtightening can warp flanges; undertightening leads to leaks.
| Connection | Torque (ft-lb) |
|---|---|
| Exhaust manifold to front pipe | 32–38 |
| Catalytic converter / downpipe to mid-pipe | 30–35 |
| Mid-pipe to muffler flange | 25–30 |
| Exhaust hanger bracket bolts | 15–20 |
- Tighten in a crisscross pattern for flanges with multiple bolts to ensure even pressure.
- Apply anti-seize to all bolt threads (not the gasket surface) to prevent seizing on stainless steel bolts.
- Recheck hanger engagement — if a rubber isolator feels loose, zip-tie it temporarily or replace it with a new unit.
- Double-check clearance around the driveshaft (if AWD), subframe, and heat shields. Rotate the steering wheel lock-to-lock to ensure no contact.
Testing and Inspection
After tightening, perform these checks before lowering the car:
- Reconnect the negative battery terminal.
- Start the engine in a well-ventilated area. Let it idle for 30 seconds.
- Listen for leaks — a “ticking” sound near flanges indicates an exhaust leak. Use a shop towel or your hand (carefully) to feel for puffs of air at each joint. If found, tighten the bolts slightly more.
- Check for unusual vibrations — rev the engine gently from idle to 3000 RPM. Vibrations may mean a hanger is missing or the pipe is touching the chassis.
- Inspect the tips — ensure they are not too close to the bumper (melting risk) or too low (scraping risk).
- Lower the vehicle and do a final road test. Drive for 5–10 minutes, then re-torque the bolts when the system is hot (use gloves). This is crucial because thermal expansion can loosen cold-tightened bolts.
Common Issues and Fixes
- Persistent leak: Replace the gasket (use OEM or Toda supplied) and ensure flanges are flat. Use a straightedge to check warpage.
- Rattle at idle: The exhaust may be contacting the heat shield. Bend the shield away slightly with a pry bar.
- Check engine light: If you removed the catalytic converter, the rear O2 sensor will trigger a code. Install a spark plug non-fouler or O2 simulator, or get a tune from a reputable shop like KTuner or Hondata.
Performance Benefits and Sound Character
Toda Racing exhausts are engineered for high-flow applications. On a J35 engine — found in Hondas like the Honda J35 series — this system typically improves throttle response, increases horsepower by 8–12 whp (depending on other mods), and reduces weight by up to 15 pounds compared to the stock steel exhaust. The sound is deep and aggressive without being obtrusive at highway speeds. Many enthusiasts pair a Toda exhaust with a cold-air intake and a tune for a balanced daily driver.
For more information on the specific part numbers for your J35 model, visit the official Toda Racing website. To learn about J35 engine specs and common upgrades, check out J35A3 Resources.
Conclusion
Installing a Toda Racing exhaust system on your J35 engine is a weekend project that delivers immediate driving enjoyment. With careful preparation, the proper tools, and attention to torque specs, you can complete the job in under three hours. The result is a lighter, more responsive car that sounds purposeful. After installation, reset your ECU by disconnecting the battery for 10 minutes, then take an hour-long drive to allow the ECU to relearn fuel trims with the increased exhaust flow. Your J35 will reward you with a crisp, free-revving character that makes every drive more engaging.