Add durability and longevity to your Duramax’s air system. The Sinister Diesel Intake Horn is a high quality aftermarket upgrade designed specifically for the 2020-2021 GM Duramax L5P, this horn replaces the unreliable and restrictive factory unit and provides several performance benefits. Our Sinister Diesel Intake horn is designed to increase air flow, using 3.5″ mandrel bent aluminum tubing. The precision designed machined billet flange gives your turbo a more consistent and healthy dosage of air. This allows for optimal flow to the turbo which eliminate turbo surging.
Our intake horn is made from 6061 Aluminum which is far superior to the factory plastic inlet. That means no cracking from weathering or from hard strain while under vacuum. This inlet cracking is a known problem of the stock part and can cause detrimental issues to your turbo. Not only is this part providing healthier airflow but it will give you the peace-of-mind you need.
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