GR86 Ignition Coils: Type A vs Type C

This one comes up a lot. Someone with an 86, a BRZ or a GR86 finds our HighSpark GR86 ignition coils, sees two listings, and asks which one is theirs. Fair question, because the two kits aren't interchangeable and the names don't make it obvious. But before fitment, let's talk about why the upgrade is worth it.

Quick note: HighSpark doesn't currently list a Premium kit for the GR86/BRZ, so the Standard Type A and Type C kits are the ones to look at.

So let's walk through how to figure it out, why we recommend replacing the whole set, and when coils are even worth looking at in the first place.

Why upgrade from stock coils?

If you're going to replace the coils on your 86, BRZ or GR86 anyway, this is a good spot to upgrade instead of just putting stock back in. HighSpark rates their spark output at 2 to 2.5 times more powerful than an OEM coil. That stronger spark is what sharpens throttle response, and HighSpark stabilizes the voltage coming out of the coil, so the engine runs smoother and more stable.

I want to be honest about the power side, though. This isn't a big horsepower part. Better combustion efficiency gives you a small gain in low-speed torque and horsepower, but it's minimal. The reason to do it is response and a smoother-running engine, and on a car this light, you feel that.

Step two: match your kit, Type A or Type C

Once you've decided to upgrade, the only thing left is fitment. HighSpark makes two boxed kits of four for these cars, and they aren't interchangeable:

Four-cylinder engine, four coils, one box. That part is simple. The tricky part is picking the right type.

The biggest takeaway: don't order by model name alone

My concern with people ordering off the car's name is that "86" covers a lot of ground. There's the Scion FR-S, the Toyota 86, the Subaru BRZ, and the newer GR86 and second-gen BRZ. Production changes happen. Two cars that look the same in the driveway can have different parts under the cover.

So instead of guessing, we'd rather you check.

How to tell which coil you have

Here's the process we walk customers through:

Pull up both product pages. Look at the photos and fitment notes on the Type A and Type C listings.
Look at your engine. With the engine off and cool, take a look at one of your coils and its connector. Take a clear photo.
Compare. If it clearly matches one listing, you're done.
Still not sure? Send us the photo along with your year and model. Tania or Kenia will confirm the match before you order.

That last step costs you five minutes. Getting the wrong kit costs you a return and a week of waiting. Easy call.

Why replace all four at once?

We get this pushback sometimes. "Only one coil is bad, why buy four?"

It's a fair point, and it's really up to you. Here's how we think about it. All four coils have the same age, the same heat cycles and the same miles. If one has given up, the others aren't far behind. You can replace the one that failed, but there's a good chance you're back under the hood in a few months doing the next one.

Replacing them as a set means every cylinder is starting from the same place. That's why HighSpark sells them as a box of four in the first place.

The tradeoff is cost up front. If budget is tight, replacing one coil to get the car running isn't crazy. Just go in knowing the others may follow.

When should you even look at coils?

Coils don't need to be on your mind if the car runs well. The signs that make us want to check the ignition system are things like:

A rough or shaky idle
Stumbling or hesitation when you get on it
A check engine light with a misfire code

Here's the thing though. Those symptoms can come from plugs, injectors, wiring and a few other places too. Coils are a common cause, not the only cause. Diagnose first. If you want to be thorough, many owners do plugs and coils at the same time since you're already in there.

Is this a performance upgrade?

We want to be straight about this. We're not going to promise big horsepower numbers from coils. The gain HighSpark lists in low-speed torque and horsepower comes from better combustion efficiency, and it's minimal. What you get is sharper throttle response and a smoother engine, plus an ignition system that's back to healthy, which matters a lot more once you start modifying the car. If you've added an intake, exhaust or tune and you're pushing the car harder, a healthy ignition system is part of the foundation.

Where this fits in a GR86 build

From what we see with customers, coils are usually a maintenance item that gets done alongside other work rather than a headline mod. People are doing bracing, tow hooks, aero, springs, and coils go in when the car is already on the lift.

If you want ideas for functional GR86 mods, this video is a good place to start:

What we see from customers

Most of the coil questions we get for these cars fall into a few buckets. Someone bought a used car with no service history and wants to refresh the basics. Someone is chasing a misfire and has already done plugs. Or someone is a few mods in and wants the foundation sorted before going further.

The first group is the easiest. If you don't know when the coils were last done, and the car has some miles on it, a fresh set is a reasonable baseline. You stop wondering about it.

The second group is where we slow down. If plugs are done and the misfire is still there, coils are a good suspect, but so is wiring. Having a shop confirm the misfire follows the coil when it's swapped to another cylinder saves you from buying parts you don't need.

The third group is the one I relate to most. Once you start modifying the car, you want fewer unknowns. Fresh coils take one variable off the table.

A quick checklist before you order

Year and model of your car
A photo of your current coil and connector
Which listing you think matches, Type A or Type C
If you're doing plugs at the same time

If you have those four things, we can confirm fitment fast. If you're missing the photo, that's the one we'd ask for first.

Installing them

On most of these cars, coils are one of the more approachable jobs. That said, we're not going to pretend every owner should do it. Work on a cool engine, be gentle with the connectors since old plastic gets brittle, and keep track of which coil came from which cylinder if you're diagnosing. If you're not comfortable, any shop that works on these cars can handle it quickly.

The next step

If you've confirmed your type, you're basically done. If you haven't, send us the photo. Either way, the goal here is to get you the right box of four the first time.

GR86 ignition coils: year and model gotchas

This is where most ordering mistakes come from. The first generation 86, the Scion FR-S, the Subaru BRZ and the newer GR86 all get lumped together in conversation. They are not all the same engine, and the coil connector and shape matter.

So we always say the same thing. Look at the coil that's in your car, compare it to the photos and fitment notes on the product page, and if you're still unsure, send us your year, model and VIN. Two minutes of checking beats a return.

Red Toyota GR86 front three-quarter view, the car these GR86 ignition coils are matched to

Install difficulty: easy to medium

On a flat four, coil access is a little different than on an inline or V engine, so give yourself time. A few things that help:

Work on a cool engine.
Disconnect the battery first.
Release each connector gently. Old clips get brittle with heat.
Do one cylinder at a time so nothing gets mixed up.

If you're not comfortable working in a tight engine bay, a shop can do this quickly. It's not a big labor job.

Maintenance after the swap

Coils don't need routine service. What they do need is healthy plugs. Worn plugs make a coil work harder, so follow your plug interval. If you ever get a misfire code later, check that cylinder's plug and boot first.

What to pair it with

Coils make sense alongside other basic GR86 maintenance and upgrades. Plugs are the obvious one. If you're planning suspension next, we carry GROW Design and HAL options for the GR86 too, and we'll be writing about those soon.

FAQ

Will the Type C kit fit my Type A car?

No, they're different parts. Check the product page photos and fitment notes, or send us a photo of your coil and we'll confirm.

I have a Subaru BRZ. Which kit is mine?

The Type C listing names the Subaru BRZ, but don't go by name alone. Compare your coil with the listing or ask us.

How many kits do I need?

These engines are four-cylinder, and each kit is a box of four. Confirm on the product page before ordering.

Should I replace spark plugs at the same time?

A lot of owners do since the coils are already out. It's up to you and your maintenance history.

Do these come with a warranty?

Check the product page for the current terms, or ask us before you order.

Do GR86 ignition coils add horsepower?

Only minimally. Better combustion efficiency gives a small gain in low-speed torque and horsepower. The real win is sharper throttle response and a smoother engine.

Next step

If you're putting a plan together, the easiest thing is to add the parts you're looking at to your cart and hit Add to Quote. We'll look it over, confirm fitment and availability, and get back to you. If you'd rather talk it through first, reach out and Tania or Kenia can help with fitment and stock questions. No pressure at all. We'd rather you buy the right part once than the wrong part twice.

GR86 Ignition Coils: Type A vs Type C, Which Do You Need?