cp-e™ QKspl™ Mazda Mazdaspeed3 Off-Road Downpipe

Purchase this product now and earn 26 BoostBucks!

Although more power and great sound are high priority items when buying a 3″ downpipe, the fine details are what ensure that the product will satisfy the end-user for a lifetime.

Also available with a catalytic converter.

Off-Road Product Terms & Conditions

Rated 5.00 out of 5 based on 2 customer ratings
(2 customer reviews)



Mazdaspeed3 Off-Road Downpipe

Custom Performance Engineering is very pleased to announce the release of our new 3″ downpipe for the Mazdaspeed3!


  • Close to +20HP at the Wheels
  • No power loss in lower RPMs
  • Fits the stock catback exhaust
  • Extra O2 bung for adding a wide band sensor
  • Cast Stainless Steel Flange
  • Cast Bellmouth
  • Industry-leading stainless steel flex joint
  • Full 3.00” mandrel bent 304 stainless steel
  • Included cp-e™ Tuneable O2 Sensor Kitwith Off-Road Downpipe
  • Made in the U.S.A.
  • LIFETIME Warranty

The cp-e™ MS3 downpipe replaces the choked factory pipe and its two restrictive cats with one high-flow cat and a 3″ mandrel bent pipe. The catalytic converter features a high-flow, all metallic honeycomb design, making it one of the most durable converters on the market. The result of our efforts is reduced backpressure, decreased turbo spool time, increased horsepower and a more aggressive sound. For the greatest dose of great sound and power, option for the downpipe without a catalytic converter, though keep in mind that a cat free downpipe is for off-road use only.

Although more power and great sound are high priority items when buying a 3″ downpipe, the fine details are what ensure that the product will satisfy the end-user for a lifetime.

The cast bellmouth piece on the downpipe ensures smooth flow and transition. The downpipe includes three Oxygen Sensor bungs – two for the factory sensor and another to add an aftermarket wideband. Our Off-road version also includes the cp-e™ Tunable O2 Sensor kit to eliminate the unwanted check engine light.

The downpipe comes complete with all necessary hardware required for a complete and professional installation, is made in the U.S.A, and includes a full lifetime warranty.

A fourth O2 bung option is available. This option is also useful for those who are looking to run a stock-frame turbo with an external wastegate on our LTRmani™ Turbo Manifold. IF you already have our downpipe and are interested in this additional bung, contact us at support@cp-e.com or (301) 576-6142.

While this may not trip a Check Engine Light, we cannot guarantee that all of the codes will be in the “ready” state.

Mazdaspeed Turbo Downpipe Highlights


Cast Bellmouth

With the stock turbo design of the Hyundai Genesis Turbo, the only way to offer perfect fitment is with a cast bellmouth on the downpipe. The non standard flange design doesn’t allow for any other solution, and we made sure to optimize flow on our new version. We also added in additional O2 bungs for our customers that want to run a wide band sensor.


Optional High Flow Cat

The cp-e™ Genesis Turbo Downpipe is available with or without a high flow catalytic converter. Maximum gains can be found without a cat, but the catted version is incredibly high flowing and sees extremely low parasitic loss from the catalytic converter.

All off road performance parts are intended for off road use only and not for street use.
Not California exhaust compliant | No implied CARB certification | Off-road use only

CALIFORNIA WARNING:Cancer and Reproductive Harm – www.P65Warnings.ca.gov

Weight 23 lbs
Dimensions 45 x 12 x 12 in

2 reviews for cp-e™ QKspl™ Mazda Mazdaspeed3 Off-Road Downpipe

  1. Rated 5 out of 5

    (verified owner)

    After dealing with the best customer service I have ever experienced with Kelly at cp-e I knew I made a wise choice with getting rid of my atp downpipe that leaked horribly I decided I wanted to go with cp-e. No other company comes close to level of quality and professionalism as cp-e. As soon as I made the trip back to my shop to install my new downpipe I had zero fitment issues was the best downpipe I have installed on any car. Cp-e has made me a customer for life !

  2. Rated 5 out of 5

    I am going to absolutely reitterate what RBailey said. Kelly at CP-e was an absolute pleasure to work with. After getting the downpipe installed yesterday, I can feel a HUGE difference in how my Speed 3 pulls. Thank you again CP-e for another amazing product!

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