Best Detroit Series 60 N2 Injectors: Which One Should You Run?

Best Detroit Series 60 N2 Injectors: Which One Should You Run?

If you’ve got a 12.7L Detroit Series 60 with N2 injectors, you’ve already got one of the most proven fueling platforms Detroit ever put on the road. The problem is: most injector advice online is either outdated, generic, or written by someone who’s never had to live with the results.

This guide breaks down the four most common N2 injector choices—what they’re best for, what power range they fit, and who should pick what.

The Quick Answer: Pick Your Injector Based on Your Priority

You’re usually choosing between two goals:

• Keep it stock-smooth and reliable

• Add power without turning it into a smoke-show

AKA..

• Maximize MPG

• Maximize horsepower

Here are the injectors we recommend most often, in order of use-case.

7045 – Stock 430 HP Fueling (RB5237045.BOS)

Best for: stock rebuilds, work trucks, “just make it right again” repairs
Factory match: 430 HP applications

If your Series 60 was born a 430 HP engine and you want it to run like it did when it was healthy—this is the no-drama choice. The 7045 is the closest thing to “OEM feel” you’ll get: smooth idle, predictable response, and easy tuning because you’re not trying to force the platform into something it isn’t.

Choose 7045 if:

• You want stock manners

• You’re doing a factory-style overhaul

• You’re not chasing big power

Part number: RB5237045.BOS

5575 – Stock Up to 500 HP (RB5235575.BOS)

Best for: stock-to-mild builds, clean power upgrades
Typical range: stock engines up to ~500 HP

The 5575 is the classic “wake it up” injector without going off the deep end. It’s a common step when you want more pulling power and better response, especially when paired with a supportive turbo setup and tuning.

It’s also a strong choice because it doesn’t require you to build the whole truck around the injector—done right, it can stay clean and drivable.

Choose 5575 if:

• You want a noticeable bump in power

• You still care about reliability and daily drivability

• You’re building a mild hot-rod or strong tow setup

Part number: RB5235575.BOS

https://momentumworx.com/genuine-bosch-5575-s-8-hole-nozzle-injectors-detroit-12-7l-series-60-set-of-6/

7650 – Economy First (With Power) (RB5237650.BOS)

Best for: Bigger power builds, but not balls to the walls 
Priority: MPG first, power second

If you’re racking up miles and fuel cost matters, the 7650 is the move. This injector is the “grown-up” choice when your main goal is POWER but you NEED economy, 

It’s a great fit for highway trucks and owners who want a clean-running setup that makes the most of every gallon while still staying in the left lane..

Choose 7650 if:

• You want economy first with Big Power

• You are working the truck daily

• You want power gains without fueling like a race truck

Part number: RB5237650.BOS

https://momentumworx.com/genuine-bosch-7650-s-detroit-12-7l-series-60-upgraded-injectors-set-of-6/

5915 – Power First (With Some Economy) (RB5235915.BOS)

Best for: performance builds, stronger midrange/top-end, “power is the point”
Priority: power first, MPG second

The 5915 is for the guys who want the truck to pull harder, plain and simple. You can still keep it clean and streetable, but compared to the 7650, the 5915 leans toward performance.

If you’re pairing injectors with a better turbo, airflow mods, and proper tuning, this is a very common “power-first” choice that still doesn’t have to be a smoke machine.

Choose 5915 if:

• You want power first

• You’re building a hot street truck or stronger work setup

• You’re okay giving up some MPG for a harder-charging engine

Part number: RB5235915.BOS

https://momentumworx.com/genuine-bosch-5915-s-8-hole-nozzle-injectors-detroit-12-7l-series-60-set-of-6/

Which One Is “Best” for You?

Here’s the simplest way to decide:

• Stock 430 HP truck? → 7045 (RB5237045.BOS)

• Stock-ish but want up to ~500 HP capability? → 5575 (RB5235575.BOS)

• You care about MPG, but are making POWER → 7650 (RB5237650.BOS)

• You live in the left lan → 5915 (RB5235915.BOS)

Final Word: Don’t Choose Injectors in a Vacuum

Injectors are only one piece of the puzzle. The “best” injector depends on:

• turbo setup

• tune quality

• airflow (manifold, piping, CAC condition)

• engine health

• intended use (work truck vs hot-rod)