Descrizione
An Engine Is Only as Strong as Its Weakest Seal. The intake boot — that unglamorous rubber elbow connecting the air mass sensor to the turbocharger — is one of the most underestimated failure points in the BMW MINI Prince engine family. When it cracks, and it always cracks eventually, the ECM reads unmetered air, fuel trims go lean, and the Check Engine Light becomes your permanent dashboard companion. The Bavarian Breather is a direct OEM-spec replacement for BMW part number 13717555784, engineered in reinforced multi-layer silicone-rubber composite that withstands the heat-cycling, vibration, and oil vapor exposure that kills the factory original.
The original BMW part was designed for a service life of roughly 60,000 miles under ideal conditions. In the real world — where engine bays hit 200°F in traffic, oil mist from the PCV system saturates the rubber, and constant turbocharger heat cycling fatigues the polymer — most intake boots start micro-cracking by 40,000 miles. The symptoms start subtle: a slightly rough idle, a faint whistle under boost, fuel economy that drops by 1-2 MPG for no apparent reason. By the time the crack is large enough to trigger a P0171 (System Too Lean) code, you have already been losing power and efficiency for months.
Our replacement uses a proprietary compound that adds 30% more silica reinforcement to the rubber matrix, improving both heat tolerance and tear resistance over the OE formulation. The inner diameter is precision-molded to within 0.3mm of specification — no wrestling with a boot that is too tight or too loose on the throttle body flange. Installation takes under 45 minutes with basic hand tools, and the reinforced material means you will replace this boot once, not every 40,000 miles.
The turbo spools. The boot holds. The code clears. This is how it should have been from the factory.
Key Features
- ✦ Direct OEM Replacement — Exact fit for BMW part 13717555784. No modification, no adapter plates, no compromises.
- ✦ Reinforced Silicone-Rubber Composite — 30% higher silica content than OE. Superior heat resistance and tear strength.
- ✦ Precision Molded ID Tolerance — ±0.3mm inner diameter consistency across the entire production batch.
- ✦ Oil & Vapor Resistant — Formulated to withstand PCV oil mist exposure without softening or swelling.
- ✦ Heat Cycled to 250°F — Validated beyond normal engine bay temperatures. No deformation under sustained heat load.
- ✦ 45-Minute DIY Install — Basic hand tools only. No lift required. Detailed fitment guide included.
- ✦ Corrects P0171 / P0174 Lean Codes — When caused by intake boot cracks, this part directly resolves the unmetered air leak.
Technical Specifications
- Part Number: 13717555784 (OEM Cross-Reference)
- Material: Reinforced Multi-Layer Silicone-Rubber Composite
- Max Operating Temperature: 250°F / 121°C (Continuous)
- ID Tolerance: ±0.3mm
- Compatibility (BMW): MINI Cooper S R55/R56/R57 (2007-2013), Clubman R55, Convertible R57, Countryman R60, Coupe R58, Roadster R59
- Compatibility (Peugeot/Citroen): 207, 208, 308, 508, 3008, RCZ (1.6 THP engines)
- Engine: N14 / N18 (Prince Engine Family)
- Installation Time: ~45 Minutes (DIY), ~30 Minutes (Professional)
- O-rings Included: Yes (Pre-installed)
- Warranty: 2-Year / 24,000-Mile Limited Warranty Against Manufacturing Defects
Application Scenarios
The Bavarian Breather addresses a predictable failure mode that affects every MINI R56 owner eventually. Diagnostic resolution: If you are chasing a P0171 or P0174 lean code and have already ruled out the MAF sensor, PCV valve, and oxygen sensors, the intake boot is the next logical suspect — and the most common root cause on N14/N18 engines with over 60,000 miles. Preventive replacement: Many MINI owners choose to replace the intake boot during turbocharger service or timing chain replacement, since the labor overlap makes the incremental cost negligible. Performance builds: Tuned MINIs running higher boost pressure (18+ PSI) stress the factory boot beyond its design spec; the reinforced composite handles elevated pressure without ballooning or cracking. Restoration projects: For buyers rehabilitating a high-mileage R56 purchased at auction or through private sale, the intake boot is a cost-effective "while you're in there" part to address alongside the thermostat housing, water pump, and vacuum lines.
Frequently Asked Questions
Q: How do I know if my intake boot is cracked?
A: Visual inspection is the first step — look for hairline cracks in the accordion folds and around the mounting flanges. If you see oil residue around the boot, that is PCV vapor escaping through a micro-crack. The definitive test: with the engine idling, spray carb cleaner around the boot; if the idle changes, you have a vacuum leak. A smoke test at a shop will pinpoint even the smallest breaches.
Q: Will this fit my 2012 MINI Cooper S (non-JCW)?
A: Yes. This boot fits all R56 Cooper S models (2007-2013), including pre-LCI and LCI, with or without the JCW tuning kit. The intake boot is identical across all N14 and N18 turbocharged variants.
Q: Do I need to replace the O-rings at the same time?
A: The Bavarian Breather ships with new O-rings pre-installed on both mounting flanges. We strongly recommend using the included O-rings — reusing old, compressed O-rings creates a secondary leak path that defeats the purpose of replacing the boot.
Q: Is this an OEM BMW part?
A: No. This is an aftermarket replacement manufactured to OEM specifications with an upgraded material compound. It is not a Genuine BMW part, but it exceeds the OE boot in heat tolerance and tear resistance due to the reinforced silica formulation.
Q: Can I install this myself without a lift?
A: Yes. The intake boot is accessible from the top of the engine bay. You will need a flathead screwdriver for the hose clamps, a T30 Torx bit for the airbox, and about 45 minutes. No lift or jack stands required. A detailed installation guide with torque specs is included in the package.
Q: Will this fix my rough idle?
A: If the rough idle is caused by unmetered air entering through a cracked intake boot — and this is the most common cause on N14/N18 engines — then yes, replacing the boot will resolve it. If the idle remains rough after replacement, continue diagnosis with the PCV valve, ignition coils, and spark plugs.
Q: Does this part work on the naturally aspirated (non-turbo) MINI?
A: No. This boot is designed for the turbocharged N14 and N18 engines only. The naturally aspirated N12/N16 engines use a different intake configuration and this part is not compatible.
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