Guide to Exhaust Baffles

Choosing the right exhaust baffle can make all the difference in performance, sound, and even staying on the right side of noise regulations. Since exhaust baffles are one of the most common items we get questions about, here’s a simple guide to help you get it right the first time.

1. Getting the Size Right

Baffles are usually sized based on the outer diameter of your exhaust pipes. For example, if you have 2 inch pipes, choose baffles designed for 2 inch pipes—not baffles that are 2 inch in diameter themselves, as they won’t fit. All baffles on our website are listed based on the pipe size they fit, with the baffle itself around 1/8 inch (approx 3mm) smaller for a snug fit.

2. Measuring Your Pipes

Not sure what size your pipes are? No problem. Measure the outer diameter of your exhaust at its widest point—usually at the rear exit. This quick step ensures you order the right size the first time.

3. Inches vs. Millimetres

Harley-Davidson exhausts (and brands like Vance & Hines) use imperial measurements (inch), while many Japanese cruisers use metric. It matters! The right fit ensures proper performance and sound control. We list both metric and imperial sizes on our site so you can work with whichever system you're most comfortable using.

4. Will Baffles Make My Exhaust Quiet?

Baffles can reduce noise by 3-5 decibels and transform a harsh roar into a deeper, throatier rumble. But don’t expect complete silence—they’re designed to tone it down, not mute it. For more noise reduction, some baffles allow you to bend the metal lugs inward, increasing interference with exhaust flow or you can add fibreglass wrap. If reducing noise is a key driver in your decision, check to see whether there are specific "Quiet Baffles" for your exhaust. 

5. Does Length Matter?

Absolutely. If you have long, straight exit pipes, a longer baffle will typically be more effective. The more surface area inside the pipe, the more the baffle can work its magic.

6. Fitting Your Baffle

Fitting is pretty straightforward but can be a bit fiddly—having a mate around definitely helps. Most exhausts already have a small hole drilled 2-3 inches from the end of the pipe (usually on the underside) for the securing bolt. If not, you’ll need to drill one, which might require removing the pipes or heat shield.

Quick Steps to Install:

1. Insert the baffle thin end first into the pipe.

2. Line up the securing hole.

3. Insert and tighten the bolt from the outside.

Tip: A snug fit is key to avoid rattling.

Need More Help?

Still unsure? Give us a call or drop by—we’re happy to help you pick the perfect baffle and make sure it fits right the first time.

Happy riding and keep it loud (but not too loud)!