Side Feed Injector Adapter Kit: 4-Cyl vs 6-Cyl Fitment
By DeatschWerks | Published: 2026-10-18
Category: Buying Guides
Learn how to choose between DeatschWerks side feed adaptor kits for 4-cyl and 6-cyl engines, including Phase 1 to Phase 2 conversion fitment rules.
Quick Answer
Choose the DeatschWerks side feed adaptor kit that matches your engine's cylinder count: the 4-cyl kit for four-cylinder applications and the 6-cyl kit for six-cylinder engines. Both convert Phase 1 to Phase 2 connector style for side feed injectors.
Why Cylinder Count Determines the Right Kit
Side feed injectors are common in certain import and domestic engines, and their electrical connectors differ between generations. DeatschWerks offers two side feed adaptor kits that are distinguished primarily by the number of cylinders they serve: a 4-cyl version and a 6-cyl version.
The cylinder count matters because the kit must match the number of injectors and the physical layout of the fuel rail. A 4-cyl kit on a 6-cyl engine simply won't have enough connectors, and a 6-cyl kit on a 4-cyl engine leaves unused connections that can complicate wiring.
Both kits convert from Phase 1 to Phase 2 connector style. This is a common upgrade when replacing older injectors with newer units that use a different electrical connector, or when swapping in a newer fuel rail.
Phase 1 to Phase 2 Conversion: What It Means for You
Phase 1 and Phase 2 refer to different generations of fuel injector electrical connectors. Phase 1 connectors are older and often harder to source; Phase 2 connectors are more common in modern EFI systems.
If you're upgrading injectors or a fuel rail, you may find that the new components use Phase 2 connectors while your vehicle's harness uses Phase 1. The DeatschWerks side feed adaptor kit bridges that gap without cutting or splicing wires.
This conversion is especially useful when you're doing a fuel injector insert kit installation or replacing the fuel injector rail, because it lets you keep the factory harness while using newer injectors.
Decision Rules: Choosing the Right Side Feed Adaptor Kit
- Count your cylinders first: Identify whether your engine has 4 or 6 cylinders. This is the single most important factor in choosing between the two DeatschWerks kits. Do not rely on the vehicle model alone; verify the engine configuration. Check the engine block or VIN to confirm cylinder count before ordering.
- Confirm the connector phase: Determine whether your current injector harness uses Phase 1 or Phase 2 connectors. Both DeatschWerks kits convert from Phase 1 to Phase 2, so if your harness is already Phase 2, this adapter is not needed. Inspect the connector shape and pin layout to identify the phase.
- Match the kit to the injector type: These kits are designed specifically for side feed injectors. If your engine uses top feed injectors, this adapter will not fit. Verify your injector's fuel delivery style before purchasing. Remove one injector or check the fuel rail to confirm side feed vs top feed.
Product Facts: DeatschWerks Side Feed Adaptor Kits
- side feed adaptor kit (6-cyl): This DeatschWerks side feed adaptor kit converts from Phase 1 to Phase 2 configuration for 6-cylinder applications. If you have a six-cylinder engine with side feed injectors, this kit provides the correct number of connectors for a clean Phase 1 to Phase 2 conversion.
side feed adaptor kit (6-cyl) - side feed adaptor kit (4-cyl): This DeatschWerks side feed adaptor kit is a Phase 1 to Phase 2 adapter kit designed for 4-cylinder applications. For four-cylinder engines, this kit gives you the exact fitment you need without extra connectors or guesswork.
side feed adaptor kit (4-cyl)
Fitment Guidance
Best for
- Owners of 4-cylinder engines with side feed injectors needing a Phase 1 to Phase 2 connector conversion
- Owners of 6-cylinder engines with side feed injectors upgrading to newer injectors or a fuel rail
Not for
- Engines with top feed injectors
- Vehicles that already use Phase 2 connectors
- Applications where you need to adapt between different injector body sizes or lengths
