Nitrous Express · New
Nitrous Express Nitrous Kit w/Billet LT4 Supercharger Lid w/10lb Bottle
MPN 20939-10 · Store SKU nex20939-10
Supplier stock checked 11/7/2026, 9:59:42 AM UTC. Adding a part does not reserve it.
Request a return within 30 calendar days after delivery. New parts must be unopened and unused.
Shipping & returns ↗This policy does not limit rights required by law.Free standard shipping on eligible parts orders of $100 or more. Oversized and freight items excluded. Fitment, taxes, availability and final totals are confirmed before payment.
Product details
This Billet LT4 Supercharger Lid replaces the upper supercharger lid on all GM LT4 Superchargers for a quick and clean install. Nitrous and fuel are injected into each cylinder from inside of the supercharger lid, providing direct port style distribution. Systems come standard as a single stage with jetting for 100 to 300WHP. This lid is made from a solid piece of billet aluminum with 1/8NPT machined directly into the lid, which makes it easy to add a direct port water/methanol later on. Nitrous System with Billet LT4 Supercharger Lid w/ 10lb bottle Nitrous System with Billet LT4 Supercharger Lid w/10lb bottle Nitrous Oxide Injection System Kit
Manufacturer fitment & guides
Check 20939-10 against the manufacturer’s application information below.
Part-specific notes
- Not CARB approved. Destination and intended-use restrictions must be checked before sale.
- Emissions acknowledgement required before purchase.
- California Proposition 65: Y
