Bosch 82mm to 74mm Reducer Adapter

The Ichiban Engineering Bosch 82mm to 74mm Adapter allows you to seamlessly install a Bosch 68mm electronic drive-by-wire (DBW) throttle body onto an intake manifold designed for the Bosch 82mm bolt pattern.
 
Perfect for tuners, fabricators, and performance builders, this adapter provides a clean, precise fit without requiring re-machining or modification to your intake. Whether you’re downsizing throttle size for better idle control, drivability, or tuning response — this adapter ensures a perfect OEM-style fit and seal every time.
 
Each adapter is CNC-machined from 6061-T6 billet aluminum, with exact tolerances for both patterns and a dual O-ring sealing system to prevent boost or vacuum leaks under all operating conditions. The internal taper has been carefully profiled to maintain smooth, uninterrupted airflow between the 82mm manifold opening and the 74mm throttle inlet.
 
Key Features
 
Direct Bolt-On Conversion:
Adapts Bosch 82mm intake flanges to fit Bosch 74mm DBW throttle bodies.
CNC-Machined Billet Construction:
Made from aerospace-grade 6061-T6 aluminum for precision, rigidity, and long service life.
Optimized Flow Transition:
Internal taper provides smooth airflow from 82mm down to 74mm for consistent performance.
Compact and Lightweight Design:
Adds minimal height between throttle and manifold while maintaining perfect alignment.
Ideal for Custom Applications:
Perfect for builders running Bosch 74mm DBW setups on larger 82mm intake patterns.
 
⚙️ Fits Bosch 82mm intake flanges and Bosch 74mm electronic throttle bodies.
📧 For technical assistance or custom requests, contact sales@ichibanengineering.com