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. Apr 15, 2023

The Benefits of Upgrading Your Downpipe - PSR Parts

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How much HP can a downpipe add?

AI Overview

A downpipe, especially when combined with a tune, can add a significant amount of horsepower, typically ranging from 20 to 50 horsepower . The exact gain can vary depending on factors like the engine's size, the turbocharger, and whether the downpipe is catted (with a catalytic converter) or catless. While a downpipe itself doesn't directly add horsepower, it allows for a more aggressive tune, which in turn increases boost and therefore, power output.

Here's a more detailed breakdown:

Stock Downpipe:

Stock downpipes with catalytic converters generally have a lower horsepower gain.
High-Flow Catted Downpipe:

Replacing a stock downpipe with a high-flow catted downpipe can add 5-10 horsepower, according to one Reddit user .
Catless Downpipe:

Catless downpipes, which have no catalytic converter, can offer a larger horsepower gain, potentially adding another 5-10 horsepower compared to a high-flow catted downpipe, according to a Reddit user .
Tuning:

The most significant horsepower gains come from tuning the engine's computer after installing the downpipe. A properly tuned engine can unlock the full potential of a downpipe, potentially adding up to 50 horsepower, according to Project Gamma.
Other Factors:

Engine size, turbocharger type, and intake systems also play a role in determining the overall horsepower gain.

will hi-flow catted downpipes increase power much or are stock good ...

Dec 18, 2022 — Tune alone nets best power gains. Downpipes can add up to 50hp and help turbo responsiveness. Downpipes and catback wi...

Bimmerpost

the downpipe HP gain thread... (stock k04) : r/mazdaspeed3 - Reddit

Oct 19, 2020 — I've seen about 5-10 hp going from a stock dp with 2nd cat delete to a high flow catted dp, and another 5-10 going fro...

Reddit ·

r/mazdaspeed3

Question about downpipe and stage 2 : r/Audi - Reddit

Mar 19, 2024 — The downpipe doesn't add any hp at all. All the added power comes from increase in boost. Some tunes require the downp...

Reddit

How much power from downpipes - BMW 3-Series (E90 E92) Forum

Nov 14, 2013

Bimmerpost

How Can Catless Downpipes Make Your Car Faster

Sep 28, 2021 — Increase in horsepower The gain may differ depending upon the size of the car's engine, turbo, and intakes. However, b...

Project Gamma Intake

7 Ways To Make Your GTI Faster

Mar 24, 2017 — Cat-backs improve the sound of your GTI and may add a small amount of horsepower. Because it retains the stock portion...

Integrated Engineering

AI responses may include mistakes. Learn more

will hi-flow catted downpipes increase power much or are stock good ...

Dec 18, 2022 — Tune alone nets best power gains. Downpipes can add up to 50hp and help turbo responsiveness. Downpipes and catback wi...

Bimmerpost

the downpipe HP gain thread... (stock k04) : r/mazdaspeed3 - Reddit

Oct 19, 2020 — I've seen about 5-10 hp going from a stock dp with 2nd cat delete to a high flow catted dp, and another 5-10 going fro...

Reddit ·

r/mazdaspeed3

Question about downpipe and stage 2 : r/Audi - Reddit

Mar 19, 2024 — The downpipe doesn't add any hp at all. All the added power comes from increase in boost. Some tunes require the downp...

How much power from downpipes - BMW 3-Series (E90 E92) Forum

Nov 14, 2013

Bimmerpost

How Can Catless Downpipes Make Your Car Faster

Sep 28, 2021 — Increase in horsepower The gain may differ depending upon the size of the car's engine, turbo, and intakes. However, b...

Project Gamma Intake

7 Ways To Make Your GTI Faster

Mar 24, 2017 — Cat-backs improve the sound of your GTI and may add a small amount of horsepower. Because it retains the stock portion...

Integrated Engineering

What is the diameter of a cast iron downpipe?

Cast iron downpipes, available off the shelf, range from sizes 65mm (2.5 inch), 75mm (3 inch), 100mm (4 inch) and 150mm (6 inch) . In addition to these pipes, there is a full range of standard fittings.