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This Remark R1-Spec single-exit cat-back gives the Subaru WRX and WRX STI a direct 3-inch exhaust path with a straight-through rear muffler. The stainless-steel version uses T304 construction for the midpipe and muffler. Remark describes R1-Spec as an aggressive-sounding system for performance-focused builds.
Fitment
| Years | Make | Model |
|---|---|---|
| 2015-2021 | Subaru | WRX |
| 2015-2021 | Subaru | WRX STI |
Remark confirms compatibility with the updated 2019-2021 models. Remove the factory donut gasket as specified by Remark. The manufacturer does not recommend aftermarket adapters because they may cause incorrect fitment.
Specifications
| Manufacturer Part Number | RK-C1076S-01C |
|---|---|
| Layout | Single-exit cat-back |
| Pipe Diameter | 3 inches |
| Midpipe Material | T304 stainless steel |
| Muffler Material | T304 stainless steel |
| Tip Material | T304 stainless steel |
| Tip Diameter | 4.5 inches |
| Tip Style | Slant-cut |
| Welding | TIG |
| Midpipe Option | Resonated |
What's Included
R1-Spec cat-back assembly with resonated stainless-steel midpipe and t304 stainless steel rear muffler and tip. This is a complete cat-back, not an axle-back kit.
Brand Information
Remark's R1-Spec line emphasizes a single-exit layout and an aggressive exhaust character. The titanium-muffler option is different from a full-titanium exhaust system.
Related Parts
- Alternative R1 configuration: Remark RK-C1076S-01
- Alternative R1 configuration: Remark RK-C1076S-01T
- Shop Remark exhaust systems
- Compare same-vehicle option: Remark R1 Full-Titanium Cat-Back for 2015-2021 Subaru WRX / WRX STI - Resonated
The linked R1 systems are alternative complete configurations.
Frequently Asked Questions
Is the midpipe titanium on the titanium-muffler version?
No. Remark specifies T304 stainless steel for the midpipe. The titanium option changes the muffler and tip material.
Do I retain the original donut gasket or add an adapter?
Remark instructs installers to remove the factory donut gasket and does not recommend aftermarket adapters because they may cause incorrect fitment.
Installation Instructions
Follow Remark's current instructions for RK-C1076S-01C. Remove the factory donut gasket as directed and do not add an aftermarket adapter without manufacturer confirmation. Check exhaust alignment and clearance after installation.
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