Turner N54/N55 Performance Stepped Intercooler

Unlock the full potential of your turbocharged N54 or N55 engine with the Turner Motorsport Stepped Intercooler. Whether you're running higher boost, track days, or just spirited street driving, this direct-fit upgrade is engineered to dramatically reduce intake air temperatures (IATs) and improve charge air flow for consistent, reliable performance.

Cooler air is denser air, and that means more oxygen per cycle for better combustion and more power. The factory intercooler quickly becomes a bottleneck under increased load or in warm conditions. Turner’s stepped intercooler solves that by offering an 80% increase in frontal surface area and cross-sectional flow, helping your BMW stay cooler and pull harder.

Constructed with high-quality cast aluminum end tanks and a bar-and-plate core, this intercooler delivers superior cooling efficiency and reduced pressure drop, even under sustained high-boost operation. The black powder-coated finish offers a clean, stealthy appearance, while the etched Turner logos add just the right touch of motorsport style.

Perfect for:
E82/E88 135i, E9X 335i/335xi, E84 X135i, E89 Z4 35i/35is

Key Features:

Direct-fit upgrade for E chassis N54 & N55 engines
Durable cast aluminum end tanks
High-efficiency bar-and-plate design
80% increase in frontal and cross-sectional area vs. stock
90% increase in charge air volume
Substantially lower IATs for improved power and reliability
Reduced and more consistent pressure drop
Lightweight design (under 20 lbs)
Dimensions: 520mm wide × 210mm tall × 130mm deep
Stealth black finish with Turner-etched logos
If you're looking to push your turbo BMW harder, the Turner Motorsport Stepped Intercooler is the cooling solution that keeps your engine running strong—pull after pull.

Full carbon fiber intake to increase flow, performance and aesthetics! Dual inlet design for maximized air flow while retaining the OEM+ fitment.

The most common N55 intake utilizes a short plastic tube and oversized cone filter; it is your job to have better taste than the common N55 owner. This carbon intake changes the whole image of the N55 engine while maintaining a flow of cool air and added induction noise. With a dual inlet design the engine bay retains its functionality while adding a second inlet to provide your engine with improved air flow and sound. To ensure the engine gets the coolest air possible the second inlet is located in the "sweet spot" on the cold side of the engine for the lowest intake air temps and most air flow possible. The cone filter features a bellmouth velocity stack filter that creates the satisfying flutter after letting of the throttle.

Our Turner Carbon Fiber Intakes start with a 3D scan of the factory intake and engine bay. Engineers use the 3D imaging of the chassis to design the intake in SolidWorks modeling software. Using a Flow Bench, the Intake is then airflow tested against the factory intake, to ensure optimal airflow improvement against stock. The final product is a beautiful and functional Carbon Fiber Intake, CAD designed for perfect integration with the OEM inlet ducting and stock mounting locations and proven to flow better than factory.

Key Benefits:

Increased flow over the factory intake
Carbon fiber airbox and intake tube with gloss clear coat for UV protection
CAD-Designed for perfect Integration
Custom high flow air filter specially designed to to pair with the carbon fiber airbox
Kit Contents:

Carbon Intake Tube
Full Carbon 2 Piece Airbox
Bellmouth Velocity Stack Cone Filter
Billet Turbo Inlet Adapter
Silicone Coupler
Hardware For Installation
Design:

- Carbon Fiber Intake Tube

Carbon inlet tube featuring a smoother interior without corrugations for a smooth flow path.
Integrated carbon flange allows secure mounting of the tube to the carbon air boxes.
Intake tube is manufactured using 2x2 twill weave carbon fiber for a great look in the engine bay.
Gloss finish clear coat for UV protection.
4-ply reinforced silicone coupler and 6061-T6 black anodized aluminum flange that utilizes the factory o-ring and retaining clip.
- Air Box

Carbon fiber airboxes are manufactured using 2X2 twill weave carbon fiber and protected with a gloss finish clear coat for UV resistance to match the intake tube.
Air box mounts in stock location with supplied hardware.
- Air Filter

Conical hi-flow reusable air filter; featuring 8 ply oiled cotton gauze construction to maximize filtration efficiency.
Bellmouth (velocity stack) filter flange inlet to reduce turbulence in order to maximize flow.
Product Development:

Turner N55 Intake System was designed, engineered, tested and quality inspected by our Research and Development team at Turner. Nothing but the highest level of precision and quality through leading-edge product development technology including FARO laser scanning for reverse engineering and quality inspection, SolidWorks 3D CAD modeling, rapid prototyping utilizing our in-house 3D printer and rigorous long term product testing. Performance data metrics are collected utilizing Mustang AWD 500 SE in ground dyno and in-house Superflow SF-750 Flowbench.

Fitment:

E82 135i N55
E88 135i N55
E84 X1 35i
E90 335/xi N55
E92 335/xi N55
E93 335/xi N55

This dual-cone intake for the 135/335/535 is similar to the enclosed carbon fiber intake but without the surrounding air box. If you love the look of the open filters and high-tech carbon fiber, this is the kit for you. High-flow cotton air filters connect to CAD engineered carbon fiber intake tubes for an improvement in air flow. The open filter layout releases more intake roar than the stock muffled intake.

135/335/535 ECS open DCI intake features -

• Designed and engineered using CAD technology for optimal flow and fitment
• Washable/reusable high flow cotton filters (pre-oiled)
• Stainless steel hardware
• Direct replacement for stock air box; integrates seamlessly with stock intake piping
• Beautiful and functional carbon fiber/e-fiberglass construction