How much difference does a downpipe make?

Author: Dr. Omer Wyman  |  Last update: Sunday, November 16, 2025

Downpipes can add up to 50hp and help turbo responsiveness. Downpipes and catback with stock tune sounds fantastic.

How much HP will a downpipe add?

An aftermarket downpipe with catalytic converters will add 10 to 20 horsepower on average, and that gain is noticeable anytime the turbo spools.

Do downpipes make a big difference?

Upgrading your downpipe can provide a significant boost to your car's performance. It can increase horsepower, improve exhaust flow, and enhance the sound of your exhaust.

Does a downpipe improve sound?

The installation of a downpipe can undoubtedly influence the sound of your car's exhaust system. It can contribute to a deeper and more aggressive tone, enhance the potential for pops and crackles, and even modify the character of the exhaust note.

What does a downpipe do for performance?

A downpipe is put in place because it allows the turbo aspect of the engine to be more effective. The downpipe steers gases away from the turbine, creating more uninterrupted power. When you get out on a straightaway and open up your Mercedes, or a similar vehicle, you'll feel the difference.

Stock vs Catless Downpipe

What are the disadvantages of downpipes?

However, there are several potential drawbacks that should be considered before opting for a downpipe installation.
  • Emissions Regulations. ...
  • Check Engine Lights. ...
  • Warranty Concerns. ...
  • Turbo Lag and Response. ...
  • Tuning Requirements. ...
  • Noise and Sound Levels. ...
  • Drivability Issues.

Do downpipes need a tune?

Yet, the pivotal question remains: does a downpipe need a tune to truly shine? The resounding consensus among experts and enthusiasts alike is a definitive yes.

What is louder downpipe or straight pipe?

Noise levels: Straight pipes are generally much louder than a stock or aftermarket downpipe. If you live in a residential area or need to comply with noise ordinances, a straight pipe may not be the best choice.

What is the life expectancy of a downpipe?

Most gutters and downpipes, including steel and aluminium gutters, are expected to last for approximately 20 years. Copper gutters are the strongest option and they offer lifespans of almost twice as long.

Is a catless downpipe worth it?

Which is Better: Catted or Catless Downpipe? A catted downpipe is preferred over the catless configuration on public roads and if you use your vehicle frequently.

Why are downpipes illegal?

Installing a downpipe increases noise and exhaust emissions levels, which would make it non-compliant with local noise and air pollution regulations, even if it is "approved" (pretend then) with a 200 catalyst cells.

What are the benefits of a downpipe?

Hence, an Armytrix downpipe allows more and easier access of air into your engine. This ensures better airflow and less restrictions, resulting in a smoother engine, more horsepower and the loudest sound possible! However, it is important to choose a downpipe that fits exactly to your vehicle.

What does upgrading a downpipe do?

Upgraded downpipes provide great increases in horsepower and torque on turbocharged vehicles by allowing exhaust gasses to flow easier as they leave the turbo. Paired with the appropriate software, a downpipe can provide significant gains and make a vehicle more fun and engaging to drive.

Does a downpipe make turbo louder?

An aftermarket downpipe can indeed contribute to an augmented turbo noise and exhaust note. As exhaust gases flow more freely through the system, the turbocharger's spooling sound might become more prominent, lending a melodious element to the driving experience.

How much HP does a stage 1 tune add?

If you're considering a stage 1 remap for your car, you might be wondering what kind of gains you can expect. In general, stage 1 remaps can provide a power increase of around 20-30%, which can be a significant boost if you're looking to improve your car's performance.

Does a downpipe change sound?

Downpipe is the biggest bottleneck in the exhaust system and it will change the sound of the car significantly (from what others have said).

Does downpipe damage turbo?

Contrary to popular belief, a properly designed and installed downpipe is unlikely to damage your turbo. In fact, it can actually benefit the turbocharger's performance by promoting better airflow and heat dissipation.

Does downpipe void engine warranty?

Instead, it will void the warranty of your stock downpipe, exhaust, and turbo. While other components, including electrical parts and batteries, will still have a warranty applicable to them.

Why are straight pipes illegal?

Make no mistake: it's illegal to operate a vehicle on the street that does not have a muffler or catalytic converters. Not only that, but virtually all places have excessive noise laws. And as we've already said, straight pipes are loud. If you drive a vehicle with no muffler, be prepared to get a ticket.

What are the cons of muffler delete?

The most significant risk associated with a muffler delete is an increase in noise pollution. Without the muffler, exhaust noises typically increase significantly and can disturb neighbors or other drivers on the road. It can put you at risk for citations from law enforcement for excessive noise levels.

Does downpipe increase torque?

As discussed earlier, a downpipe can lead to increased horsepower and torque, resulting in improved acceleration and responsiveness. This enhancement can be especially noticeable in turbocharged engines, where exhaust flow plays a critical role in turbo spooling and power delivery.

How much horsepower does a downpipe add?

Downpipes can add up to 50hp and help turbo responsiveness. Downpipes and catback with stock tune sounds fantastic. My worries is that supposedly the downpipes make a difference on the tune and relive back pressure on the turbos. My only hesitation is sound and how many horses the stock downpipes are made to withstand.

How much does a tune cost?

A full tune up can run you between $200 and $800. As noted above, the cost of tune up varies depending on the cost of parts and labor where you live. DIY for the mechanically inclined. Some drivers like to roll up their sleeves and perform basic tune ups themselves.

Do downpipes need to be glued?

As with all of our Gutter systems, the downpipe pushes directly onto the bottom of the Running Outlet or Stopend Outlet - no other connector is required. No adhesive or sealant is needed to make the joint but we recommend that you should always support any downpipe with a pipe clip within 200mm of the outlet.

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