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With 3.6in through hole, tapered to 4in for the throttle body. 3‑dimensionalmachined center, brings maximum airflow

Replacing part numbers for reference 551597. Fit for DBW and for DBC throttle bodies

Easily add the 4‑bolts 4in throttle body to the 3‑bolts 3.6in intake manifold

Aerospace‑grade aluminum alloy material, rugged, anti‑corrosion and durable

Simple to install, no complicated tools required, no damage to your car