Automotive accessory that seals the secondary air injection ports after system removal, freeing space around the 1.8T cylinder head. Owners who want a cleaner engine bay and fewer vacuum hoses will appreciate the straightforward approach. Is the fit and finish right for Mk4, B5 and B6 1.8T owners looking for a direct replacement? shirylzee 1.8T SAI Block Off Plate
⚡ At a Glance
- • Fitment: Made for 1.8T cylinder heads on Mk4, B5 and B6 platforms, engineered for accurate alignment
- • Best for: Owners removing the secondary air injection system who need a tidy, reliable seal
- • Not ideal for: Engines other than 1.8T Mk4/B5/B6 or users who require intact SAI functionality
CNC-machined from billet aluminium to match cylinder head profiles precisely. Supplied with bolts, O-ring and lock washer for straightforward installation and a reliable seal.
Neater engine bay – with CNC-machined billet aluminium plate
CNC machining produces accurate mating surfaces and consistent dimensions that follow the 1.8T head profile. Smooth aluminium faces minimise gaps where leaks or misalignment can occur.
Frees space behind the block and removes a rat's nest of vacuum hoses, making the engine bay easier to work on and more presentable.
Reliable sealing – with included O-ring and precise fit
A correctly sized O-ring compresses against the machined surface to form a seal, while tight tolerances reduce the chance of vacuum leaks. Billet aluminium resists deformation under heat and torque.
Helps prevent vacuum loss after SAI removal and restores the sealed function of the port, giving confidence during road use and diagnostics.
Quick maintenance turnaround – with supplied bolts and lock washer
A complete hardware kit includes the necessary bolts and lock washer so the plate can be installed using basic hand tools. The design allows simple removal if access behind the head is required later.
Can be fitted or removed by a home mechanic with minimal time and no specialised equipment, cutting workshop hours.
✨ The 4 Key Reasons for shirylzee 1.8T SAI Block Off Plate
- Space saving – Frees up area behind the block for easier maintenance
- Durable construction – Billet aluminium resists warping under engine heat
- Direct-replacement ready – Matches function and fit of worn original parts
- DIY-friendly – Installs with basic tools and minimal workshop time
📋 Technical Details at a Glance
- Category: Automotive Parts and Accessories
- Compatibility: 1.8T engines on Mk4, B5 and B6 platforms
- Material: Billet aluminium
- Manufacturing: CNC machined for precise shape and fit
- Included hardware: Bolts, O-ring, lock washer
❓ Frequently Asked Questions
Q: Will this fit my car?
A: Designed specifically for 1.8T cylinder heads on Mk4, B5 and B6 models, so compatibility is limited to those platforms.
Q: Is installation difficult?
A: No, the plate comes with bolts, an O-ring and a lock washer and fits with basic tools for a straightforward install and removal.
Q: Can it replace an original SAI component?
A: Yes, the plate is described as an ideal replacement for old or worn parts and matches the function and fit of the original component.
🏆 Our Verdict
Suitable for Mk4, B5 and B6 1.8T owners who have removed the secondary air injection system or need a reliable replacement. CNC-machined billet aluminium construction and a supplied hardware kit deliver an accurate seal and easier access around the head. Offers solid long-term value through durable material and direct-replacement fit, reducing future maintenance hassle.
