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Description
Xforce | 3" Stainless Steel Cat Back Adaptor Pipe | Subaru WRX & STI | E4-SW05-C1Subaru WRX Cat Back Adaptor E4 SW05 C1 The Xforce Cat Back Adaptor pipe is an essential component for Subaru WRX and STI owners installing an aftermarket cat back system where the factory OEM catalytic converter pipe differs in length. This adapter bridges the gap between the cat back system and the factory downpipe, ensuring a secure and leak free connection. Crafted from durable raw 409 stainless steel, it is built to withstand the heat and
Subaru WRX Cat Back Adaptor - E4-SW05-C1
The Xforce Cat Back Adaptor pipe is an essential component for Subaru WRX and STI owners installing an aftermarket cat-back system where the factory OEM catalytic converter pipe differs in length. This adapter bridges the gap between the cat-back system and the factory downpipe, ensuring a secure and leak-free connection. Crafted from durable raw 409 stainless steel, it is built to withstand the heat and vibration of performance driving.
What's in the Box?
- 1x 3" Raw 409 Stainless Steel Adaptor Pipe
- 1x Heavy-Duty Slip Joint Clamp
Features:
This product offers the following functional features:
- Adjustable Slip Joint: Features a versatile slip-joint design that allows for an adjustable length ranging from 260mm to 440mm, providing the perfect fit for various model years and configurations.
- 3" Mandrel-Bent Tubing: The 3-inch diameter ensures no restriction in exhaust flow, maintaining the performance benefits of your high-flow cat-back system.
- 409 Stainless Steel: Constructed from raw 409-grade stainless steel for excellent thermal durability and long-term structural integrity.
- Problem Solver: Specifically designed for vehicles with shorter factory catalytic converter pipes that otherwise would not reach a standard-length cat-back system.
Specifications:
- Make: Subaru
- Model: WRX / STI
- Part Number: E4-SW05-C1
- Material: 409 Stainless Steel
- Diameter: 3.0 Inch
- Length Adjustment: 260mm - 440mm
Important Information
- This part is typically required when fitting Xforce cat-back systems to specific JDM or ADM models where the factory cat length varies.
- The image shown may not reflect the actual product
- Shipping times may vary depending on destination and stock availability
Vehicle Applications:
Vehicle Applications for E4-SW05-C1
| Make | Model | From | To | Body | Series | Engine | Variant | Drivetrain |
|---|---|---|---|---|---|---|---|---|
| SUBARU | ||||||||
| Subaru | WRX | 1994 | 2014 | Sedan / Hatch | GC / GD / GV | 2.0L / 2.5L Turbo | All Variants | AWD |
| Subaru | WRX STI | 1994 | 2014 | Sedan / Hatch | GC / GD / GR | 2.0L / 2.5L Turbo | All Variants | AWD |
Warranty Information
| Product Type | Warranty Period |
|---|---|
| 304 & 201 Stainless Steel Exhaust Systems | 60 Months |
| Accessories | 12 Months |
| Catalytic Converters | 12 Months |
| Electronic Products (Including SmartBox) | 12 Months |
| Mild Steel & 409 Stainless Steel Exhaust Systems | 24 Months |
| Mild Steel Headers | 12 Months |
| Stainless Steel Headers | 24 Months |
| Universal 304 Stainless Steel Mufflers | 24 Months |
| Universal Mild Steel & 409 Stainless Steel Mufflers | 12 Months |
Payment & Security:
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.4 ★★★★★
Based on 1887 reviews
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Product Reviews
★★★★★ 4
Solid Purchase
Size: X-Small, Color: Red
This coat delivers strong quality and clean style. The fabric feels sturdy and warm, and it holds its shape well in cold weather. The color stays bright, and the stitching looks secure. The fit is true to size, and the coat layers easily over sweaters without feeling bulky.
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Reviewed in the United States on December 8, 2025
★★★★★ 5
Coat lover
Size: Large, Color: Black
This coat is warm, stylish, and very well made. The stitching is clean and the fabric feels durable. It’s perfect for layering and works great with jeans or leggings. I love that it keeps me warm without feeling bulky. Great value for the price.
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Reviewed in the United States on February 23, 2026
★★★★★ 5
Good quality
Size: Medium, Color: Navy
I gave this as a Christmas present and he loved it. I was worried when I ordered it that the quality might not be that good, but I worried for nothing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
★★★★★ 3
This is more like a long cardigan sweater, than a coat.
Size: Small, Color: #2 Blackandwhite
This is more like a long cardigan sweater, than a coat. It doesn't have much structure & the pocket placement is too high for a coat. That being said, it's very soft & comfortable. As far as sizing goes, the sleeves run a bit long, but the coat, itself, runs a bit tight. I'm 5'10'' and a small fit me, but I wouldn't be able wear anything very thick under it & I'm thin. It's light & machine washable. I almost kept it to wear as a long sweater, but it looks like a coat ,so I sent it back. If you're very thin with long arms and don't mind the pockets being a bit high, then this could be a very stylish piece for you. Otherwise, I would pass.
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Reviewed in the United States on January 17, 2026
★★★★★ 5
i would definitely recommend. stick with your regular size or size up for a less slim fit
Size: Small, Color: Black
I usually wear a medium, I ordered a small based on reading the reviews. I am 150lbs 5’4”. this coat fits great for me personally. it’s not bulky, it’s not baggy. it is a slim fit jacket, definitely more on the slender side. when i raise my arms above my head , the sleeves do come up a bit. I would suggest sticking to your normal size or if you want a less slim fit with a tiny bit more room, sizing up wouldn’t be an issue. the coat is super soft and has some weight to it. i would recommend this jacket, it is warm and a nice piece for formal attire.
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Reviewed in the United States on February 18, 2026
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