The NX “Gemini EFI System” replaces the factory MAF sensor housings on LT-1 and LS-1 GM cars. This 6061 billet aluminum high flow MAF housing will increase airflow and the twin discharge nitrous system will make your F-body a giant killer! Single stage horsepower settings: 35-150WHP. Dual Stage: 35-150WHP X 2. Each stage is capable of 250WHP with the purchase of additional jetting.