Which cars does the EJ25T Direct Ignition Coil Pack Set for VAF fit?

Cusco USA lists part number 6A1 748 A for the EJ25 turbo STI from the 2004 GDF to the 2021 VAF, and for the SG9 Forester. The EJ25T Direct Ignition Coil Pack Set for VAF plugs into the factory connectors on each.

Does it fit the WRX as well as the STI?

Cusco USA lists this set for the EJ25 turbo STI models and the SG9 Forester only. The 2015 and later WRX uses the FA20 turbo engine and takes Cusco Type-2 set 966 748 A instead. Check the engine code against the Applications list before ordering.

Why replace working factory coils?

A coil that delivers a stronger, more consistent spark helps the mixture light reliably when cylinder pressure is high, which is where a tuned or boosted engine asks the most of its ignition. Cusco builds this set for drivers who have raised boost or compression and want more ignition headroom to match.

Does it need a tune or ECU change?

No. Cusco describes the set as a direct replacement for the factory coil packs that works with the factory ECU, so it plugs into the factory harness and needs no change to the calibration. On a tuned car, keep the spark plug type and gap that the tuner specifies.

Should the spark plugs be changed at the same time?

It is a good time to check them, because the plugs are exposed once the coils come out. Fit plugs of the heat range and gap the engine calls for, which may be colder than stock on a tuned car, and replace any plug that shows wear or fouling.

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Description

Cusco EJ25T Direct Ignition Coil Pack Set for VAF Subaru WRX STI, Impreza WRX STI and SG9 Subaru Forester

Cusco’s EJ25T Direct Ignition Coil Pack Set for VAF Subaru WRX STI, Impreza WRX STI and SG9 Subaru Forester replaces the four factory direct ignition coils on the turbocharged EJ25 with Cusco’s High Spark Power coils, a multi-spark cycle design Cusco quotes at approximately 46 percent above the factory coil. It suits an STI or Forester XT running more boost than stock, where cylinder pressure is highest and ignition headroom matters most. The set plugs into the factory connectors and works with the factory ECU.

Design and Performance

The EJ25 turbo makes much of its power at high boost, and the higher the cylinder pressure, the more voltage it takes to jump the spark plug gap. A coil working near its limit shows up first as a misfire under full load, often mistaken for a fuel or tuning problem. The EJ25T Direct Ignition Coil Pack Set for VAF replaces all four factory coils with Cusco’s High Spark Power design, fitting the factory plug wells and connectors so no wiring changes are needed.

Features

Direct replacement for the factory coil packs
Works with the factory ECU, per Cusco
High Spark Power multi-spark cycle design
Approximately 46 percent above the factory coil, per Cusco
Sold as a set of four

Specifications

Cusco part number: 6A1 748 A
Type: Direct ignition coil pack set
Engine: Subaru EJ25T (2.5L turbo)
Quantity: Set of 4
Design: High Spark Power, multi-spark cycle
Rating, per Cusco: Approx. +46% against the factory coil
ECU: Works with the factory ECU
Fitment type: Direct OE replacement

Applications

Subaru WRX STI: VAF | 2015-2021 | EJ25T (2.5L turbo)
Subaru Impreza WRX STI Hatchback: GRB / GRF | 2008-2014 | EJ25T (2.5L turbo)
Subaru Impreza WRX STI Sedan: GVB / GVF | 2011-2014 | EJ25T (2.5L turbo)
Subaru Impreza WRX STI: GDF | 2004-2007 | EJ25T (2.5L turbo)
Subaru Forester: SG9 | 2003-2008 | 2.5L, Cusco lists NA and turbo

Notes

Cusco describes this set as a direct replacement for the factory coils that works with the factory ECU
Installation labor is not included

Frequently Asked Questions

Which cars does the EJ25T Direct Ignition Coil Pack Set for VAF fit? Cusco USA lists part number 6A1 748 A for the EJ25 turbo STI from the 2004 GDF to the 2021 VAF, and for the SG9 Forester. The EJ25T Direct Ignition Coil Pack Set for VAF plugs into the factory connectors on each.
Does it fit the WRX as well as the STI? Cusco USA lists this set for the EJ25 turbo STI models and the SG9 Forester only. The 2015 and later WRX uses the FA20 turbo engine and takes Cusco Type-2 set 966 748 A instead. Check the engine code against the Applications list before ordering.
Why replace working factory coils? A coil that delivers a stronger, more consistent spark helps the mixture light reliably when cylinder pressure is high, which is where a tuned or boosted engine asks the most of its ignition. Cusco builds this set for drivers who have raised boost or compression and want more ignition headroom to match.
Does it need a tune or ECU change? No. Cusco describes the set as a direct replacement for the factory coil packs that works with the factory ECU, so it plugs into the factory harness and needs no change to the calibration. On a tuned car, keep the spark plug type and gap that the tuner specifies.
Should the spark plugs be changed at the same time? It is a good time to check them, because the plugs are exposed once the coils come out. Fit plugs of the heat range and gap the engine calls for, which may be colder than stock on a tuned car, and replace any plug that shows wear or fouling.

About CUSCO

CUSCO is the brand of Carrosser Co., Ltd., founded in December 1977 and based in Takasaki, Gunma Prefecture, Japan. Carrosser designs and builds coilovers, limited-slip differentials, clutches, roll cages and chassis parts, sells its steel cages under the Safety 21 name, and competes in every All Japan Championship category from circuit racing to rally and gymkhana. CUSCO USA, a division of Carrosser, is based in Huntington Beach, California.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Cusco EJ25T Direct Ignition Coil Pack Set for VAF Subaru WRX STI, Impreza WRX STI and SG9 Subaru Forester [6A1 748 A]

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Cusco EJ25T Direct Ignition Coil Pack Set for VAF Subaru WRX STI, Impreza WRX STI and SG9 Subaru Forester

Design and Performance

Features

Specifications

Applications

Notes

Frequently Asked Questions

About CUSCO

Reviews