SKU: HS15SW4GST
Invidia 2015+ Subaru WRX/STI Single Racing Titanium Tip Cat-back Exhaust
The Invidia HS15SW4GST full cat-back exhaust system fits 2015-2021 Subaru WRX and 2015-2020 STI VA-chassis models. It replaces the factory exhaust from the rear oxygen sensor back using 3-inch mandrel-bent piping and a single racing titanium tip for power gains up to 12 wheel horsepower and 10 lb-ft torque. This design cuts backpressure boosts exhaust flow and sharpens throttle response with a deep aggressive tone.
Key Features
- 304 Stainless Steel Piping: 76mm (3-inch) diameter mandrel-bent tubing resists corrosion and maintains shape under high heat for consistent performance
- Single Burnt Titanium Tip: 115mm (4.5-inch) racing-style single wall tip sheds heat quickly adds visual appeal and cuts weight versus stainless alternatives
- Performance Gains: Delivers up to 12 wheel horsepower and 10 lb-ft torque increases through improved scavenging and reduced restriction verified on dyno tests
- Sound Profile: Produces a refined turbocharged growl at cruise with race-inspired roar under acceleration without cabin drone
- Weight Savings: System weighs 28 lbs lighter than OEM by 10-12 lbs for better handling and quicker acceleration
Product Notes
- Direct bolt-on replacement no cutting or welding required for stock-like fitment
- Inspect tip periodically for road debris damage to preserve finish
- Ships fully assembled in protective packaging to prevent shipping damage
Installation Notes
- Professional installation recommended.
- Bolt-on design uses factory hangers and mounts with included gaskets and hardware
- Requires basic tools lift and 2-4 hours labor time
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2015-2021 | Subaru | WRX | Base |
| 2015-2021 | Subaru | WRX | Limited |
| 2015-2021 | Subaru | WRX | Premium |
| 2015-2020 | Subaru | WRX STI | Base |
| 2015 | Subaru | WRX STI | Launch Edition |
| 2015-2020 | Subaru | WRX STI | Limited |
| 2016 | Subaru | WRX STI | Series.HyperBlue |
Why Choose Invidia?
- Established Japanese engineering focused on Subaru turbo platforms since 1994
- Every system dyno-tuned for real-world power and sound balance
- Precision TIG-welded construction ensures leak-free operation for years
Frequently Asked Questions
- Q: Does HS15SW4GST fit 2015-2021 WRX models with automatic transmission?
A: Yes it bolts directly to both manual and CVT WRX variants from 2015-2021 as well as STI up to 2020 using factory midpipe connection - Q: What material is the tip made from?
A: Burnt titanium single-layer construction for durability lightweight design and distinctive blue hue after heat cycling - Q: What warranty coverage applies?
A: Invidia offers a limited lifetime warranty on manufacturing defects when installed by certified shop with proof
Shipping & Handling
- Method: UPS Ground or Freight for oversized items
- Availability: In stock – ships same or next business day
- Packaging: Oversized box measures 52 x 14 x 14 inches
- Weight: 38 lbs shipping weight (28 lbs product weight)
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