Speed Series AT2 Full Exhaust for 675SS: Installation Tips

By Yoshimura R&D of America, Inc. | Published: 2026-10-22

Category: How-to Guides

Install the Yoshimura Speed Series AT2 full exhaust on your CFMOTO 675SS with these step-by-step tips. Avoid common mistakes and get a perfect fit.

Quick answer

Install the Yoshimura Speed Series AT2 full exhaust on your CFMOTO 675SS by following these ordered steps. Each step includes a common mistake to avoid and a checkpoint to ensure a successful installation.

Why proper installation matters

The AT2 full system is engineered to unlock the 675cc triple's potential. A careful install ensures you get the performance gain without leaks or fitment issues.

What you'll need

Basic hand tools: socket set, Allen wrenches, torque wrench, anti-seize compound, and a clean work area. The AT2 system includes all necessary hardware.

Step-by-step installation guide

1. Prepare the bike: Park the 675SS on a level surface and let the engine cool completely. Disconnect the battery negative terminal to prevent accidental ignition. Common mistake: working on a hot engine can cause burns and warp components.
2. Remove the stock exhaust: Unbolt the stock muffler and header pipes. Loosen the clamps and slide the system off. Keep the stock gaskets if they're in good shape. Checkpoint: inspect the exhaust ports for carbon buildup and clean them with a soft brush.
3. Install the AT2 header pipes: Apply a thin layer of anti-seize to the header pipe ends. Insert each pipe into the exhaust ports and hand-tighten the flange nuts. Do not fully torque yet. Common mistake: over-tightening at this stage can misalign the pipes; keep them loose for adjustment.
4. Attach the AT2 muffler: Slide the muffler onto the header pipes using the supplied springs or clamps. Align the muffler so it clears the rear wheel and frame. Tighten all fasteners to spec. Checkpoint: rotate the muffler slightly to avoid contact with the swingarm under load.
5. Torque and final check: Torque the header nuts to the manufacturer's specification (typically 15-20 ft-lb). Reconnect the battery. Start the engine and listen for exhaust leaks. Let the system heat-cycle once, then re-check all fasteners. Common mistake: skipping the re-torque after a heat cycle can lead to loose nuts and exhaust leaks.

Product facts

675SS 25-26 AT2 Stainless Full Exhaust, w/ Stainless Muffler: The AT2 Speed Series full system is built around Yoshimura's legendary AT2 muffler profile, designed to boost power on the CFMOTO 675SS. You get a true performance upgrade, not just a cosmetic change—proper installation ensures you realize those gains on the road or track.
675SS 25-26 AT2 Stainless Full Exhaust, w/ Stainless Muffler