MAZDASPEED3 SS 3" Downpipe

$ 695.00

Availability: Ships in 24 hours
Product Code: 571202

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An extensive amount of engineering time was poured into developing the COBB MAZDASPEED3 SS 3" Downpipe to produce the best all around option for the market.

Starting with the CAD designed investment-cast turbine outlet, made of 304 stainless steel for enduring corrosion resistance and reduced heat transfer to the engine bay. The bellmouth shape of the outlet flange makes optimal use of the tight confines of the MS3's engine bay, smoothly blending turbine outlet and wastegate gases. The outlet also contains two O2 sensor bungs to accomdate the stock O2 sensor and offer the option for additional sensor installation to suit each individuals needs.

Next comes the custom spun metal substrate high flow catalytic converter. This single piece 400 grade stainless steel cat provides a much higher flow rate and longer lifespan than the typical ceramic or "brick" style cats common seen without sacrificing the ability to quickly reach proper temps for cleaner cold-start emissions. We also made sure to include one more bung just after the cat for the second OEM O2 sensor.

Right after that comes the stainless steel flex section which is internally lined to protect the steel braiding while maintaining optimal exhaust flow. The placement of the flex section just before the first exhaust hanger is important as well. This minimizes the effects of engine movement on the cat, flanges, and remaining exhaust components. Plus, the use of the factory donut flange design allows for compatibility with any cat-back exhaust designed to work with the factory cat section.

Lastly, all tubing and hangers are manufuctered using corrosion resistant 304 stainless steel with a beautiful mirror polish to make sure the downpipe looks as good as it flows and sounds.

Installation of any aftermarket Mazdaspeed3 downpipe requires an upgraded Cam Shaft Driven Fuel Pump (CDFP) and tuning to ensure adequate fuel supply and safe engine performance.


The COBB 3" Downpipe is one of the key upgrades for the MAZDASPEED3 to unluck a huge amount of torque hidden away within the MZR 2.3 DISI Turbo engine from the factory. Considerable effort was spent designing a flow path with the fewest number of directional changes and minimal degrees of bend in order to eliminate restrictions that have been found in the stock system. This beautifully fabricated downpipe delivers significantly improved exhaust flow, resulting in faster turbo response time and power gains across the entire rev range.

MAZDASPEED3 SS 3" Downpipe
  • CAD Designed Cast Turbo Outlet for Maximum Flow
  • 200 Cell High Flow Catalytic Converter
  • Three O2 Bungs for Factory & Aftermarket Sensors
  • Factory Location of Flex Section Eliminates Stresses
  • Utilizes Stock Donut Gasket for Optimal Sealing & Long Life

Customer Photos

MAZDASPEED3 SS 3" Downpipe is rated 4.9 out of 5 by 11.
Rated 5 out of 5 by from Very high quality Compared to all the others on the market this one stands alone. The cast flange is the first indication that something is different. The fit is outstanding; however, the install was a bit difficult...that is if you don't us your brain. There is the original front pipe bracket that is bolted onto the left rear of the engine. The stock downpipe WILL NOT come out unless this bracket is removed. This can be done by reaching through the left wheelwell with a 3/8 ratchet, 6" extension, and a 14mm socket. One removed the stock pipe practically fell out. The performance is outstanding and the quality is as equally amazing!
Date published: 2014-04-25
Rated 5 out of 5 by from Worth it I had the following criteria when buying a downpip: - pass emissions - not much of an increase in sound This DP has by far surpassed my expectations. Throttle response is vastly improved, turbo spools sooner and the powerband has widened. Sound is great, its a bit deeper and not too invasive when used with the stock exhaust. It took me about two months of research, I always found myself coming back to this. If you are on the fence, buy this!
Date published: 2014-04-23
Rated 5 out of 5 by from Perfect fit, only one complaint. Product is manufactured with a great amount of care. The installation is timely, but not difficult. The product is expensive but, makes up for it in its quality. I think COBB should be able to include new hardware. The old bolts coming out of the car weren't in great condition, so now I'm on the search for new hardware...Overall, fantastic product!
Date published: 2015-01-20
Rated 5 out of 5 by from Worth it but not the easiest part to install. Just installed this last weekend and it was no walk in the park. Some of the exhaust bolts can be extremely difficult to remove, leverage in the tight space is the issue. I ended up having to cut the small heat shield off with a dremel as the bolt closest to the fire wall stripped (thank you Harbor Freight tool quality). Also I found it necessary to remove the frame cross brace in order to get the stock unit out. Good luck if you do it yourself, a second set of hands is almost essential at times.
Date published: 2015-11-12
Rated 5 out of 5 by from Best part you can buy for your MS3 All I have to say is wow!!! Transforms your MS3 into a BEAST. Fits perfect. Wish it came with new bolts for the CBE connection. Mine were very rusted had to use different ones.
Date published: 2017-12-03
Rated 5 out of 5 by from It ROARSSS ! Had this monster since May 2013 after getting my internals upgraded. gains are very noticeable and the sound is incredibly awesome especially I have an aftermarket cat back exhaust !! good job Cobb ! would definitely recommend this downpipe out there who wants extreme gains and awesome ROAR sound ! PS: i live in a cold weather half of the year and it makes the full turbo back system louder on idle/ driving (but not the annoying droning sound) ! loveeee it !
Date published: 2014-04-23
Rated 5 out of 5 by from Amazing product!!!! After installing this I am amazed by the power gain!!! My Speed feels like a rocket and my tires are screaming. Super quick shipping!!! Too bad Cobb doesn't have their CBE anymore or I'd recommend that. Don't forget the spring bolts when installing this.
Date published: 2014-04-23
Rated 4 out of 5 by from Downpipe stock pain in the A## To install the new DP was piece of cake but that old DP was so hard to removed the cobb video they makes it look easier.
Date published: 2014-11-23
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