034Motorsport Silicone Breather Hose Kit with Billet PCV Valve for Audi TT, Volkswagen Golf, and Volkswagen Jetta 1.8T AWP (2003–2005)

The 034Motorsport Breather Hose Kit is a complete silicone crankcase breather hose set with a billet check valve that replaces the stock breather hoses on 2003–2005 Audi TT, Volkswagen Golf, and Volkswagen Jetta models with the transverse 1.8T engine. One kit takes the place of six factory parts: the valve cover breather hose, the block to intake manifold hose, the T-hose, the block breather tube, the valve cover breather tube, and the PCV check valve. The factory breather hoses on these engines are known to deteriorate quickly from constant heat, oil vapor, and crankcase pressure. The kit includes a billet aluminum block breather adapter with an o-ring seal that uses the factory retaining clip, so no new clip is needed at the block. The kit is made in the United States.

034Motorsport parts sold by PMB Performance carry a 24-month warranty.

The kit is built around late-production AWP engines. Late cars use the 25 mm valve cover breather hose (06A 103 221 AN) and the late block to intake manifold hose (06A 103 221 BM), and those are the two versions this kit replaces. It also covers the T-hose (06A 103 247), the block breather tube (06A 103 213 F), and the valve cover breather tube (06A 103 213 AF), with the billet valve taking the place of check valve 035 103 245 A. A crankcase breather hose carries pressurized blow-by gas from the crankcase to the PCV valve, which separates oil vapor and returns it to the engine while the air is routed into the intake. 034Motorsport, founded by Javad Shadzi in 2005, designs, tests, and builds its Audi and Volkswagen parts in-house at its Performance Facility in Fremont, California.

Technical Details

• Manufacturer: 034Motorsport
• Part number: 034-101-3007
• Construction: silicone hoses with a billet check valve
• Block breather adapter: billet aluminum with o-ring seal, retained by the factory clip
• Replaces six factory parts: 06A 103 221 AN, 06A 103 221 BM, 06A 103 247, 06A 103 213 F, 06A 103 213 AF, and 035 103 245 A
• Engine: transverse 1.8T, AWP engine code only, model year 2003 and later
• Emissions status: 48-state legal, not CARB approved
• Made in the United States
• Warranty: 24 months

Installation & Tuning Notes

The auxiliary check valve breather hose is eliminated when this kit goes on. That hose can be plugged, or the provision on the valve cover can be capped off.

Common Questions

Can I install this kit on a car registered in California or New York?
No. The kit is 48-state legal but not CARB approved, so it is not legal for installation on cars in California or New York.

What signs point to failed breather hoses on a 1.8T?
Cracked or split hoses, broken plastic connectors, oil residue around the hoses, a check engine light for an intake air leak, and in severe cases a misfire or rough running.

PMB Performance sells this kit as a one-order fix for the whole 1.8T breather circuit.

Fitment & Compatibility

Check the fitment table below for your exact model and year. Make sure your engine carries the AWP engine code before ordering. Send us your VIN and we will confirm fit.