Exhaust Mufflers

Has the original muffler rusted through, or do you want a different sound from your exhaust? This category brings together mufflers and upgrade kits for you who want to replace or adapt a single part of the system rather than the entire exhaust.

What a muffler does in the exhaust

The muffler dampens the engine's sound before the exhaust gas leaves the car. Depending on the design, this is done with chambers, perforated tubes or sound-absorbing material, and it affects sound level, tone and back pressure. Together with a resonator, which we group under resonators, it can typically also reduce drone at certain rpm. Both types are found under mufflers and resonators.

How to choose a muffler

Start with the measurements of your system and assess several factors at once:

• Pipe diameter: must match your pipes, e.g. 2.25 or 2.5 inches. A larger diameter does not automatically give more power.
• Inlet and outlet: designations such as IN(O)/OUT(C) in e.g. Flowmaster product names show whether the connection is offset or centered, which determines how the muffler can be positioned.
• Space and shape: length, cross-section and hangers must fit the underbody and heat shields.
• Material: stainless steel can typically resist rust longer than mild steel, but it depends on the quality.
• Sound: sound level and tone depend on the design, so consider whether the car will mainly be driven daily or on track days.

Universal mufflers typically require adaptation during installation. The category includes brands such as Magnaflow, Borla, Stainless Works and Gibson.

Frequently asked questions

What do (O) and (C) mean in the product names?

The letters indicate whether the inlet and outlet are offset (O) or centered (C) on the muffler. This matters for how the pipes can be routed and whether the muffler fits the space you have under the car.

Can a new muffler pass the vehicle inspection?

It depends on the product and the car. Check the noise level and any E-mark for the specific part number before installing, and be aware that a louder sound can cause problems at inspection.

Does installing a muffler require welding?

It depends on the muffler. Universal models typically need to be adapted and welded or fitted with clamps, while an upgrade kit may be made for a specific car. Check the pipe diameter and hangers before you order.