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People also ask
Is it bad to run a catless downpipe without a tune?
Running a catless downpipe without a tune is generally not considered "bad" in the sense that it will instantly damage your engine, but it can lead to potential issues like a check engine light, and you will not be getting the maximum performance benefits. A tune is recommended to prevent a check engine light (CEL), optimize performance by adjusting the air-fuel ratio for the increased airflow, and avoid potential risks like boost spikes or engine running too lean.
This video discusses the safety of running a catless downpipe without a tune:
Gears & Gains
YouTube · Jun 9, 2025
Potential issues without a tune
- Check Engine Light (CEL):The most common issue is the check engine light turning on because the post-catalytic converter oxygen sensor will detect the missing catalytic converter.
- Sub-optimal performance:Without a tune, the ECU can't fully take advantage of the increased airflow, which limits potential horsepower and torque gains.
- Risk of performance problems:While many cars can handle the change, there's a risk of the engine running too lean, causing detonation, or having power cut in and out under heavy load due to the ECU not being properly calibrated for the new airflow.
- Boost spike:The increased airflow can cause the turbo to spool up faster, potentially leading to a temporary boost spike that the stock ECU may not handle correctly.
Benefits of a tune with a catless downpipe
- Maximizes performance:A tune adjusts the air-fuel ratio and boost control to get the most horsepower and torque from the new downpipe.
- Prevents check engine light:A tune can specifically tell the ECU to ignore the CEL for the catalytic converter, which is often done using an O2 sensor spacer or by adjusting parameters within the tune.
- Ensures engine safety:A proper tune ensures the engine is running with the correct air-fuel mixture, preventing lean conditions that could lead to engine damage.
You can watch this video to learn about the performance review of a catless downpipe:
Driving Production
YouTube · Oct 18, 2021
What you can do
- Get a tune:The ideal solution is to get a tune to properly complement the new downpipe and prevent the potential problems listed above.
- Install an O2 spacer:If you don't want a full tune, you can try an O2 sensor spacer to trick the sensor and prevent the CEL, but this won't optimize performance.
- Run without a tune for a short time:If you plan on getting a tune later, it is possible to run the catless downpipe without one for a while, but it is wise to be aware of the risks, especially with aggressive driving.
AI responses may include mistakes. Learn more
Is it bad to run a downpipe without a tune? | SupraMKV - 2020+ Toyota Supra Forum (A90 MKV Generation)
Aug 15, 2024
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Downpipe without a tune? - 2Addicts | BMW 2-Series forum - Bimmerpost
Oct 7, 2015 — mike@x-ph.com 08:56 PM 07-11-2015. Running catless downpipes with no tune is fine. You will not take 100% advantage of ...
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Worse case if i needed to bring the car in for repair i could always put the stock downpipe back on. Also my plan would be to add ...
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Dec 20, 2024 — Comments Section * Peylix. • 1y ago. Top 1% Commenter. Here's a snippet from a DAP blog regarding running an aftermar...
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Will a catless downpipe damage my engine if installed without a tune?
May 20, 2025 — It won't damage anything, but a tune is still recommended. You'll get a check engine light for having no catalytic con...
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EcoBoost Mustangs
Greetings everyone, I've had my M5 for a few months now, I just recently picked up some primary and secondary catless downpipes. I got the downpipes through a friend although I'm still waiting for a few parts to show up but I'm a little tired of the stock sound. I wanted to throw on the downpipes but do I have to run a tune, will the car still run good without a tune? I do plan on tuning later down the road. Thanks !
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Jun 9, 2025 — is it bad to run your BMW. with no tune and catless downpipes. and have a check engine light honestly the answer is no ...
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Is a Catless Downpipe on a stock tune safe for g20 b58 m340i xdrive?
Bottom line the secondary o2 sensor will trigger a cel but its just an emissions warning and doesn't affect anything. You can igno...
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Jun 28, 2025 — What could happen if you don't tune for catless down pipe * Phillip Phillip. The upstream (pre-cat) O2 sensors are th...
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Mar 1, 2024 — if you change air/fuel ratios you should tune.
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How much horsepower does a catless downpipe add?
A catless downpipe typically adds 15-30 horsepower (hp) on turbocharged cars, with gains potentially reaching 20-50+ hp with an ECU tune, as removing the catalytic converter reduces exhaust restriction for faster turbo spool and better engine breathing, but tuning is crucial to fully utilize gains and prevent issues. The exact boost varies greatly by vehicle, engine size, turbo setup, and other mods.
Typical Gains:
- Without Tune: Expect noticeable gains, maybe 10-25 hp, with improved turbo response.
- With Tune: Gains can jump significantly, often 20-30 hp, and sometimes much more (even 50+ hp) by allowing higher boost levels.
Why It Works:
- Less Restriction:The catalytic converter is a major choke point in the exhaust system; removing it allows exhaust gases to exit faster.
- Faster Turbo Spool:Quicker gas flow makes the turbo spin up sooner, improving low-end torque and response.
Key Factors:
- Vehicle Specifics: Different cars (e.g., Subaru WRX vs. BMW M4) see different results.
- Tuning is Key: A tune is essential to fully exploit the airflow improvement and see maximum power gains, notes Flashark and Project Gamma.
- Other Mods: Gains are amplified with other airflow mods (intakes, tunes).
Important Considerations:
- Emissions: Catless downpipes will cause you to fail emissions tests and are illegal for road use in many areas.
- Smell & Sound: Expect a louder exhaust and potentially a "rotten egg" smell.
AI responses may include mistakes. Learn more
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Does going catless require a tune?
It won't damage anything, but a tune is still recommended. You'll get a check engine light for having no catalytic converter, but that won't affect vehicle performance, and unfortunately, that code can't be tuned out of the ECU.May 20, 2025
Will a catless downpipe damage my engine if installed without a tune?
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Catless downpipe for Porsche Cayman / Boxster 2016
Racing Dynamics
https://www.racdyn-usa.com › PROD
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Porsche 718 Forum
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718 Boxster / Cayman SOUL Competition Downpipe
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Unlock extra turbo sound, flat four aggression, and increased response with a bolt in catalytic converter delete downpipe.
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Reddit · r/Porsche_Cayman
4 comments · 9 months ago
Reddit · r/Porsche_Cayman
4 comments · 9 months ago
Are there any tuners that would even touch my car with no catalytic converter? Of course the safe play is to buy the sport cat but it's another $1500.See more
4 answers · Top answer: Cobb accessport and a custom tune possibly.
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Purchase a replacement downpipe with a catalytic converter for your 718 online at Flat 6 Motorsports! These pipes allow for more power from your Porsche.
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Porsche 718 high flow catted downpipe for sale
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For Sale ECS 718 200 cell midpipe. $750.00 plus shipping to USA only. I am located in Dade City Florida.. Any questions please PM me.
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