If you're looking to ditch that unreliable PCV breather hose on your EA839 engine, the 034Motorsport PCV Breather Hose is where it’s at. This isn’t just another upgrade for your tuned ride; it’s a serious safety upgrade for all EA839-equipped vehicles. I’ve seen firsthand how the factory setup can let you down. Those internal check valves that are supposed to manage crankcase pressure? They can fail faster than you’d think, leading to all sorts of headaches—like pressurized crankcases and hot oil spewing out where it shouldn’t. Trust me, you don’t want to be the one dealing with a potential engine fire because of a blown PCV system.
So, how does this whole PCV thing work? At idle or when you're cruising without boost, the engine’s vacuum system is doing its job, pulling air in and keeping things balanced. But once you hit the gas and the boost kicks in, that same connection can get pressurized, and that’s where the factory check valves struggle. They’re just not built to handle the high-stress environment of a turbocharged engine. I’ve seen it happen—pressure builds up, seals fail, and before you know it, you’re looking at a mess under the hood.
What makes the 034Motorsport hose different? For starters, they’ve engineered their own check valves that can handle over 40 PSI while providing a smooth flow. These aren’t your run-of-the-mill components; they’re made from a tough synthetic rubber that can take the heat and the pressure. The whole setup is housed in a 4-ply reinforced silicone hose, so you don’t have to worry about it collapsing or inflating under pressure. Plus, it’s designed to work seamlessly with the OEM Air Oil Separator, which is crucial for proper crankcase pressure control.
Installation? Piece of cake. You can swap it out without needing to replace the entire turbo inlet system, which is a cost-saver right there. The OE-style connections make it easy to remove when you’re servicing your turbo inlet, and you get to keep your factory engine cover intact. It’s a no-brainer for anyone who wants to keep their engine running smoothly without breaking the bank on frequent replacements.
And let’s be real—this isn’t just for the performance junkies. Whether you’re running a stock setup or have your ride tuned to Stage 3, this breather hose is built to last. I’ve seen it tested on various 034Motorsport development vehicles for over two years, and it holds up. Meanwhile, the stock hoses can fail in just a few months, leaving you stranded or worse.
What’s Included:
Key Features:
Fitment:
If you want peace of mind and a reliable solution for your EA839 engine, the 034Motorsport PCV Breather Hose is definitely worth considering.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Make Vehicle | Model | Year |
|---|---|---|
|
2020-2024 Audi A6 |
A6 | 2020-2024 |
|
2019-2024 Audi A7 |
A7 | 2019-2024 |
|
2018-2024 Audi S4 |
S4 | 2018-2024 |
|
2018-2024 Audi S5 |
S5 | 2018-2024 |
|
2018-2024 Audi SQ5 |
SQ5 | 2018-2024 |

034 Motorsport was founded in 2005 for enthusiasts by enthusiasts with a passion for bringing motorsport-quality performance upgrades and tuning to Audi and Volkswagen vehicles. Since its inception, the company has grown to meet the expanding needs of petrolheads with innovation, quality, and performance in mind. 034 Motorsport is dedicated to providing customers with only the finest performance products, tuning, and service for their Audi or Volkswagen.
Dedicated to the Car Scene034Motorsport is owned and operated by car enthusiasts just like you! This means that you can count on them for expert advice and products that deliver each and every time. When they aren’t at work, you can find the 034 Motorsport folks at local car meets, Audi Club Track Days, or simply at home working on their own rides.
Being gearheads themselves, the 034 Motorsport staff understands the importance of a strong automotive community and giving back to the customers they owe their success to. 034Motorsport is a proud sponsor of Audi Club North America's Golden Gate Chapter, in addition to several other popular automotive forums, including Audizine, Fourtitude, VWvortex, and QuattroWorld. The brand also supports NorCal Audi Club, and frequently hosts events for its members.
Involvement in Competition Racing034Motorsport stays true to its roots (and name) by actively participating in motorsport events, like time attacks, endurance racing, and hill climbs. These events allow the company to simultaneously showcase its products and racing expertise, while putting them to the ultimate test. A number of 034 Motorsport’s most iconic projects, including the Time Attack A4, GTI-RS, and 80tq raised the bar for on-track performance, while also accelerating production and testing processes.
Extensive Quality Product Lineup034 Motorsport is well-known for producing some of the finest race-proven performance upgrades for Audi and Volkswagen enthusiasts. The 034 Motorsport performance facility is located in Fremont, California and home to its engineering, manufacturing, and tuning departments. The company prides itself on in-house manufacturing, where it designs, fabricates, calibrates, and tests all products under one roof with complete control. 034 Motorsport carries a wide range of products that includes suspension parts, motor mounts, intakes, silicone hoses, and numerous underhood goodies.
Find 034 Motorsport at Vivid RacingYou can find an extensive lineup of quality 034 Motorsport parts right here at Vivid Racing. We carry everything from 034 Motorsport blow-off valves, cold air intakes, intercoolers, differentials, and ventilation systems to wheel spacers, springs, turbos, mid-pipes, and steering components. Whatever you may possibly need, chances are we carry it! If you cannot find a particular item above or have any questions, please call our sales team at (480) 966-3040.
It is the intention of 034Motorsport to sell only quality products. We offer a 1-year warranty against defects in workmanship or materials, not extending to normal tear and wear or mis-use. You must provide us with a proof of purchase, defect or the result of wear or mis-use. Some products have less than 1-year warranty. Please inquire before ordering.
034Motorsport will only replace or repair warranty items. No refunds will be given. 034Motorsport or the product manufacturer will inspect or test all products prior to a warranty claim adjustment. This process may take up to 6 weeks. You must obtain an RMA number from either Customer Service or Technical Support prior to any return. All products we offer are warranted to be free from defects prior to installation. Any modification or improper use voids this warranty. This warranty does not cover installation. 034Motorsport shall be the final arbitrator in interpreting the extent and remedy of warranty.
034Motorsport warranties are not transferrable, and available to the original purchaser only, however if you do buy a 034Motorsport part second hand and have a problem with it, do contact us as we can typically arrive at a reasonable, fair solution.