Coil-on-plug conversion kits & looms

Modern Spark For Classic Subaru EJs

Upgrade your ageing factory ignition setup with a cleaner, more modern coil-on-plug conversion — built for stronger spark delivery, better reliability under load, and a neater install.

Stronger spark Better response Cleaner install Built for boosted EJs
Shop Full Kit Shop Looms Only

Not sure which one you need? Choose the full kit if you want everything included. Choose loom-only if you already have compatible coils and plugs.

Full Conversion Kit
Roo Racing coil-on-plug conversion full kit

Complete setup

Loom + coils + plugs

Shop Looms Only

Why upgrade?

Why Upgrade To Coil-On-Plug?

Older Subaru ignition systems can become a weak point as the car ages — especially when the car is seeing boost, heat and load.

01

Stronger ignition architecture

Instead of relying on one older coil pack setup, coil-on-plug gives each cylinder its own individual coil.

02

Better suited to boosted driving

Hard pulls, heat, load and boost expose weak ignition quickly. A cleaner COP setup helps modernise one of the key systems your EJ relies on.

03

Cleaner install

The right loom allows the conversion without cutting, splicing or permanently hacking the factory wiring.

04

More confidence in the car

The real win is knowing your ignition setup is better suited to spirited driving, hard pulls and proper use.

Full Kit vs Loom Only

Full Conversion Kit
Loom Only
Best for
Complete ignition upgrade
DIY COP setup
Main outcome
Modernise the whole ignition setup
Wire your own COP conversion cleanly
Coils included
Yes
No
Spark plugs included
Yes
No
Loom included
Yes
Yes
Best buyer
Wants everything sorted in one package
Already has or wants to choose coils and plugs
Main benefit
Less guessing, complete setup
Flexibility and clean wiring
Choose the full kit if you want the cleanest path to the performance outcome. Choose loom-only if you already know your coil and plug setup.

Performance outcomes

Built For Cars That Still Get Used Properly

This isn’t just about replacing old parts. It’s about giving your EJ a cleaner, more modern ignition setup that can better keep up when the car is under load.

⚡

Cleaner spark delivery

Individual coils give each cylinder its own dedicated ignition source for a cleaner, more direct ignition setup.

🛡

Less ageing ignition baggage

Move away from the older factory coil pack setup and modernise one of the key systems your EJ relies on.

🏁

Built for proper driving

Daily, hills, track days, spirited driving — your ignition system needs to keep up when the car is under load.

🔧

No wiring hack job

The conversion loom helps keep the install clean and far more confidence-inspiring than cut-and-splice DIY wiring.

Choose your setup

Full Kit Or Loom Only?

Choose the full kit if you want the complete conversion package. Choose loom-only if you already have compatible coils and plugs sorted.

Complete setup

Full Coil-On-Plug Conversion Kit

Best for owners who want the complete ignition upgrade in one package. Includes conversion loom, NGK coils, NGK spark plugs, hardware and instructions.

  • Best path for a complete conversion
  • Less parts hunting and less guesswork
  • Ideal for owners upgrading the whole setup
Shop Full Kit
DIY setup

Coil-On-Plug Conversion Looms

Best for owners who already have compatible coils and plugs, or want to spec their own setup. Get the wiring side sorted without cutting or splicing the factory loom.

  • Best if you already have coils and plugs
  • Cleaner wiring for your COP conversion
  • Ideal for DIY and custom ignition setups
Shop Looms Only

Important Questions

Do I need a tune?

Generally, a coil-on-plug conversion is an ignition hardware upgrade, not a power-adding tune by itself.

However, requirements can vary depending on the vehicle, ECU, setup and existing modifications. For modified cars, always check with your tuner.

Is it really plug-and-play?

The looms are designed to remove the need for cutting, splicing or soldering. You still need basic mechanical confidence and must choose the correct loom/kit for your model and ignition setup.

Will this fit my GC8?

Fitment depends on model year and ignition configuration. Use the fitment guide below or contact Roo Racing before ordering if you are unsure.

NO CUTTING. NO SPLICING. NO HALF-COMPLETE SETUPS.

Upgrade your ignition the right way.

Whether you need the complete Roo Racing x NGK conversion kit or just the loom to finish your own setup, this is the clean path to coil-on-plug.

Pick the right option for your Subaru and give your ignition system the upgrade it’s been waiting for.