The Rog Journal

Exhaust resonator delete: what it really changes.

4 min read

    Updated: 9 October 2026.

    In short. A resonator delete means replacing the factory resonator or centre silencer with a straight pipe. The sound becomes a little louder and rawer; drone can appear at a steady cruising speed, depending on the car. As for power, published tests show no measurable gain.

    What it does to the sound.

    • A little more volume. The difference ranges from slight to clear depending on the car and the rest of the exhaust: the rear silencer still does most of the work.
    • A rawer tone. The metallic edge and the rasp come through, sometimes with more bass.
    • A risk of drone. See below.

    What it does to power.

    Nothing measurable with a straight-through resonator, the most common type. On the dyno, one manufacturer replaced the factory resonator on a Ford Mustang GT with H-pipes and X-pipes, with no power gain. Another quotes exactly the same gain for its systems with and without resonators. The only published counter-example: a very restrictive spiral resonator on a diesel tuned to 720 hp. That is not the case with the straight-through resonators found on sports cars.

    The risk of drone.

    Drone is a low-pitched sound linked to engine speed: it appears when the engine's frequency meets a resonance in the cabin, often at a steady cruising speed. After a simple delete of the factory resonator, some cars drone and others do not: it depends on the engine, the gearbox and the rear silencer. On a Rog exhaust, this risk is dealt with at the design stage: with the valves closed when cruising, the gases flow through the rear silencer and the cabin stays calm. See why our systems stay calm on the motorway.

    What the rules say.

    Any modification to the factory exhaust must respect the noise level specified for your vehicle, recorded on the registration certificate (field U.1): see our article on the noise level in the registration certificate. Some countries also check noise on the road: see noise cameras in Europe. Check the rules in your country before modifying your exhaust.

    A single pipe or a system designed as a whole.

    A delete pipe changes only one part: the rest of the factory exhaust, designed around its resonator, stays in place. A complete system is designed as a whole, from the mid-pipe to the tips.

    On the models where the option exists, Rog exhausts come with a straight pipe as standard, with a valved rear silencer designed to avoid drone: valves closed for everyday driving, open when you want to hear your engine. On more than 140 models, you can choose the resonator when ordering, at the same price, for a rounder and slightly softer voice. To compare the two: Straight pipe or resonator, which sound to choose.

    Frequently asked questions.

    Does a resonator delete add horsepower?

    No, not measurably with a straight-through resonator. Published dyno tests show no gain; it is a sound modification.

    Does a resonator delete make the car louder?

    A little louder, and above all rawer. The rear silencer remains the part that lowers the volume the most.

    Is a resonator delete the same as a full straight-pipe exhaust?

    No. A full straight-pipe exhaust usually removes every silencer. A resonator delete only removes the resonator: the rear silencer stays in place.

    Can a resonator be replaced with a straight pipe?

    Yes, that is the principle of a resonator delete. On a Rog exhaust, it is the straight pipe version, offered by default; the resonator can be chosen when ordering on the models concerned.

    Does a resonator delete damage the engine?

    No published test shows any damage or loss of torque caused by simply removing a straight-through resonator. The idea that an engine needs back pressure has not been demonstrated.

    Is it better to remove the silencer or the resonator?

    Removing the rear silencer changes the volume far more; removing the resonator mainly changes the tone. A valved exhaust means you do not have to choose: valves closed for everyday driving, open when you decide.

    Sources.

    All accessed on 9 October 2026.

    1. Diesel Army, “Do Resonators Rob Horsepower On Your Diesel?” (22 October 2023): https://www.dieselarmy.com/news/exhaust-resonator-rob-horsepower/
    2. SAE 2019-26-0171, “Low Frequency In-Cab Booming Noise Reduction in the Passenger Car”: https://saemobilus.sae.org/content/2019-26-0171
    3. Wikipedia (de), “Auspuff”: https://de.wikipedia.org/wiki/Auspuff

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