2015-2021 Subaru WRX/STI - Ignition
2015-2021 Subaru WRX/STI ignition parts matter when you want a stronger spark, cleaner pulls, and fewer misfires once cylinder pressure goes up. Shop coils, spark plugs, wires, and harnesses to support steadier spark energy, cleaner combustion, and better reliability under load. JD Customs is the right source because the lineup is built around proven fitment, enthusiast-trusted brands, and parts that make sense when you actually drive the car hard. It is the kind of catalog that saves time, cuts out guesswork, and keeps the build moving.
Let customers speak for us
from 2729 reviews
Some may say they are only valve stem caps, but honestly…they are far more. The quality from JD Customs is everything people have been talking about. Decided to dip my toe into the burnt titanium water that JDC offers, and now I’m buying a snorkel. This certainly will not be my last purchase.
These look much better than the stainless bolts that come on Airlift struts and hold tight after use. A great upgrade!
Work of art! It’s actually kind of breathtaking when you open the box.
Thank you Paul, for helping me put with this badge. This badge looks amazing and I love it underneath of my Subaru Sti.
Absolutely perfect in every way possible definitely a perfect touch to the controller
As always you guys killed it with the design and quality and customer service delivery was super quick what else can I say other then I love everything I’ve gotten from JDC
The power steering cap is a must-have piece for your Mitsubishi. The quality of the lettering and etching is incredible. And shout out to the team who color the parts. I wanted a bare background and burnt lettering so that it would match my engine bay theme and colors. They typically don’t do that, but they went out of their way to laser etch around the burnt lettering on top and polish the sides to remove the burnt coloring. They did this for all of my other parts too! I can’t thank y'all enough! I highly recommend JDC’s products!
It’s beautiful 😍, I’d buy it over and over, JDC always with the best titanium parts and ideas.
High quality titanium parts look awesome under the hood👍🏽👍🏽👍🏽👍🏽👍🏽
Hands down the best titanium goods you’ll find. Worth every penny!
Title say it all. Works perfect, every time. No effort required
Amazing quality and craftsmanship. It was customized just like I wanted. Once the car is finished being built I'll add a picture to the review.
Unmatched style and precision of craftsmanship very happy customer
As always the team at JDC goes above and beyond my expectations with the quality and dedication to delivering a killer product I truly appreciate them and the complements just keep coming through about the products that are on my car and I’m not done yet 🤩🤩🤩🤩
reorder many times, love the product very much, thanks!
Subaru WRX STI (2015–2021) Ignition FAQ's
Please read our FAQs page to find out more.
What spark plug heat range suits a tuned EJ257?
One step colder than stock is common for elevated boost. Gap to your tuner’s spec—tighter gaps often help resist blowout under load.
Are coil upgrades worthwhile on the STI?
Quality coils can improve spark energy and consistency with higher cylinder pressures. Pair with the correct plugs and dwell settings.
Why does my STI misfire only at high load?
Usually plug gap, aging plugs, marginal coils, or a boost leak. Verify fuel quality and tune health before pushing harder.
