Engine & Power · Buyer's Guide
Fuel Rails
High-flow billet rails replace stock plastic ones; required for serious forced-induction builds and aftermarket injectors over ~80 lb/hr.
Recommended Picks
A starting point for your build, sorted by budget.
All Fuel Rails (9)
View as grid- Holley EFI Hi-Flow Billet Fuel Rails$1
- Grams Performance Fuel Rails$149.99
- Snow Performance Billet Fuel Rail Kit for Factory Height Injectors$225.99
- Grams Performance High-Flow Fuel Rails; Black$254.99
- Holley EFI Hi-Flow Billet Fuel Rails$255.95
- Holley EFI Hi-Flow Fuel Rails$255.95
- BBK Performance High Flow Fuel Rails$269.99
- BBK Performance High Flow Fuel Rails$269.99
- Holley EFI Hi-Flow Billet Fuel Rails$356
19. FUEL SYSTEM — INJECTORS AND PUMPS
When Do You Need Upgraded Injectors?
- Stock 5.7L injectors: ~24 lb/hr — sufficient for stock and mild bolt-ons
- Stock 6.4L injectors: ~30 lb/hr — sufficient for Stage 1–2, marginal at Stage 3 NA
- Stock 6.2L Hellcat injectors: ~62 lb/hr — sufficient for stock boost, upgrade needed for pulley + power mods
Rule of thumb: Injectors should be sized at 80% duty cycle max. At 100% duty cycle, you're "running lean" at the top end. For a supercharged build, calculate needed injector size: HP ÷ BSFC ÷ number of injectors × safety margin.
Injector Size Guide by Build
| Build Level | Target HP | Injector Size |
|---|---|---|
| Stock / Stage 1 bolt-ons | Up to 500 HP | Stock size (no change) |
| Stage 2 + mild cam | 500–600 HP | 60 lb/hr (DeatschWerks) |
| Supercharged (mild boost) | 600–750 HP | 1000cc (DeatschWerks, ID) |
| Supercharged (aggressive) | 750–900 HP | 1100cc–1500cc |
| E85 flex fuel builds | Any HP | 1300cc+ |
Key Brands
- DeatschWerks: Most popular HEMI injector brand. Every unit is matched on a flow bench before shipping. 1000cc, 1100cc, 1500cc options for HEMI. Direct drop-in fit.
- Injector Dynamics (ID): Premium matched injectors. ID1050x is popular for supercharged builds.
- Mopar/OEM-size options: Good for mild builds where you just want direct replacement quality
When Do You Need an Upgraded Fuel Pump?
The stock in-tank pump flows approximately 255 l/hr — fine for naturally aspirated up to ~500 HP. Under boost or at high RPM with aggressive injectors, the pump becomes the bottleneck.
Pump options:
- DeatschWerks DW300 (340 l/hr, drop-in replacement) — best value direct-fit pump upgrade
- Walbro 450 LPH — high-output option for high-boost builds
- Fore Innovations Triple Pump Hat — for extreme builds 900+ HP where one pump isn't enough
- Boost-A-Pump (BAP) — increases voltage to stock pump temporarily under boost; band-aid solution but works for mild setups
Flex Fuel / E85 Notes
E85 ethanol has lower energy density than gasoline but higher octane (~105 RON). Running E85 requires:
- Injectors sized ~30% larger than gasoline-only equivalents
- Fuel pump capable of higher volume
- E85-compatible fuel rails and lines
- Custom tune for E85 fueling tables
- Flex fuel sensor (if running pump gas + E85 blend)
On E85, a supercharged HEMI can see 30–50+ HP over the same pump-gas tune due to higher octane and charge cooling from ethanol evaporation.
Site UX Recommendations
- Injector sizing calculator concept: "Enter your target HP and engine → see recommended injector size"
- "Required with supercharger" badge on injectors and pumps in the context of SC kits
- E85 compatibility clearly marked on fuel parts that support it