1.8T Engine Tuning Guides
Tuning guide for 1.8T AGU engines with 150 hp
Maximum power for Golf 4 and A3 with engine code AGU
Regardless of statutory warranty claims, we offer a voluntary three-year warranty on our BAR-TEK® products and Turbo-Total brand performance turbochargers. This warranty covers defects in materials and workmanship. The statutory rights of the consumer ("warranty holder") remain unaffected by this warranty.
The warranty takes effect from the date of purchase.
The warranty is void in the event of improper use and, in particular, in the following cases:
Our racing engines are excluded from the three-year warranty.
In the event of a warranty claim, we have the right to either replace or repair the defective part. Claims beyond repair are not accepted. Claims by the warranty holder due to intentional or grossly negligent conduct on our part, our agents, or legal representatives, as well as claims for injury to life, body, or health, remain unaffected.
The warranty applies exclusively to the original purchaser. In particular, it does not apply in the case of resale or gifting.
Here you can download the warranty terms and conditions.
Regardless of statutory warranty claims, we offer a voluntary three-year warranty on our BAR-TEK® products and Turbo-Total brand performance turbochargers. This warranty covers defects in materials and workmanship. The statutory rights of the consumer ("warranty holder") remain unaffected by this warranty.
The warranty takes effect from the date of purchase.
The warranty is void in the event of improper use and, in particular, in the following cases:
Our racing engines are excluded from the three-year warranty.
In the event of a warranty claim, we have the right to either replace or repair the defective part. Claims beyond repair are not accepted. Claims by the warranty holder due to intentional or grossly negligent conduct on our part, our agents, or legal representatives, as well as claims for injury to life, body, or health, remain unaffected.
The warranty applies exclusively to the original purchaser. In particular, it does not apply in the case of resale or gifting.
Here you can download the warranty terms and conditions.
Top-mount exhaust manifold made of stainless steel casting with T25 flange for transverse 1.8T engines.
With our new manifold for transverse 1.8T engines you give your turbocharger insane response. You’ll notice this especially in comparison with conventional log manifolds, which can’t hold a candle to our manifold. We designed it for optimal flow: the 4-to-1 design and the 48 mm cross-sections enable pulse charging and prevent the exhaust gases from becoming turbulent and creating back pressure. That’s why you already feel a noticeable performance increase in the mid-range that really puts a smile on your face. You can easily achieve a full 500 hp with our turbo manifold.
Since we use only the best material, this turbo manifold is made from the stainless steel casting your dreams are made of. It is extremely difficult to cast, but it offers the best properties: it is optimally suited for extreme heat and cannot rust. The CNC machining completes the high quality, as it enables a very precise result and an excellent surface finish.
Top mount means that the turbocharger is mounted above the manifold. Together with the T25 connection, it is the ultimate combination for Garrett turbochargers with T25, for example from the GTX or EFR series. Of course, other turbochargers with a T25 connection also fit.
For use in motor racing, we use only materials with the best properties. As an alloy for our manifolds, we therefore chose a heat-resistant stainless steel casting with the not very well-known name “1.4849”. It consists of a complex blend of chromium, manganese, molybdenum, nickel, niobium, phosphorus, sulfur and silicon. The most important properties of material 1.4849 include in particular its heat resistance of up to 1100 degrees Celsius and its high elongation at break. This makes it the material of dreams when it comes to the highest thermal and mechanical loads – and as if made for demanding use in motorsport. That’s why it was clear that we only wanted the best of the best for our components and your tuning projects!
Note: Depending on the design of the actuator, material must be removed from the valve cover to provide sufficient clearance.
All manifold features at a glance:
Suitable turbochargers:
Average rating of 0 out of 5 stars
1 review
11 March 2025 10:23
Review with rating of 5 out of 5 stars
no comment
no comment
1.8T Engine Tuning Guides
Maximum power for Golf 4 and A3 with engine code AGU
1.8T Engine Tuning Guides
Up to 320 hp: How to tune your 1.8T engine with code AEB
1.8T Engine Tuning Guides
You can more than double the performance of your Audi S3!
1.8T Engine Tuning Guides
From 180 hp up to 666 hp with your 1.8T engine!
1.8T Engine Tuning Guides
More driving fun with your Audi A4 - up to 666 hp!
Full power for your Audi A4: Up to 666 hp performance!
With these power levels you can reach up to 666 hp!
1.8T Engine Tuning Guides
Pro guide for up to 666 hp power!
BAR-TEK®
BAR-TEK Motorsport GmbH
Im Rauschen Auel 3, 51491 Overath-Brombach, Germany
Top-mount exhaust manifold made of stainless steel casting with T25 flange for transverse 1.8T engines.
With our new manifold for transverse 1.8T engines you give your turbocharger insane response. You’ll notice this especially in comparison with conventional log manifolds, which can’t hold a candle to our manifold. We designed it for optimal flow: the 4-to-1 design and the 48 mm cross-sections enable pulse charging and prevent the exhaust gases from becoming turbulent and creating back pressure. That’s why you already feel a noticeable performance increase in the mid-range that really puts a smile on your face. You can easily achieve a full 500 hp with our turbo manifold.
Since we use only the best material, this turbo manifold is made from the stainless steel casting your dreams are made of. It is extremely difficult to cast, but it offers the best properties: it is optimally suited for extreme heat and cannot rust. The CNC machining completes the high quality, as it enables a very precise result and an excellent surface finish.
Top mount means that the turbocharger is mounted above the manifold. Together with the T25 connection, it is the ultimate combination for Garrett turbochargers with T25, for example from the GTX or EFR series. Of course, other turbochargers with a T25 connection also fit.
For use in motor racing, we use only materials with the best properties. As an alloy for our manifolds, we therefore chose a heat-resistant stainless steel casting with the not very well-known name “1.4849”. It consists of a complex blend of chromium, manganese, molybdenum, nickel, niobium, phosphorus, sulfur and silicon. The most important properties of material 1.4849 include in particular its heat resistance of up to 1100 degrees Celsius and its high elongation at break. This makes it the material of dreams when it comes to the highest thermal and mechanical loads – and as if made for demanding use in motorsport. That’s why it was clear that we only wanted the best of the best for our components and your tuning projects!
Note: Depending on the design of the actuator, material must be removed from the valve cover to provide sufficient clearance.
All manifold features at a glance:
Suitable turbochargers:
Average rating of 0 out of 5 stars
1 review
11 March 2025 10:23
Review with rating of 5 out of 5 stars
no comment
no comment
1.8T Engine Tuning Guides
Maximum power for Golf 4 and A3 with engine code AGU
1.8T Engine Tuning Guides
Up to 320 hp: How to tune your 1.8T engine with code AEB
1.8T Engine Tuning Guides
You can more than double the performance of your Audi S3!
1.8T Engine Tuning Guides
From 180 hp up to 666 hp with your 1.8T engine!
1.8T Engine Tuning Guides
More driving fun with your Audi A4 - up to 666 hp!
Full power for your Audi A4: Up to 666 hp performance!
With these power levels you can reach up to 666 hp!
1.8T Engine Tuning Guides
Pro guide for up to 666 hp power!
BAR-TEK®
BAR-TEK Motorsport GmbH
Im Rauschen Auel 3, 51491 Overath-Brombach, Germany