Upgrade your Subaru WRX STI (VAB) or WRX S4 (VAG) with the HKS Super Turbo Muffler Ti — a full titanium cat-back muffler built for drivers who want a meaningful weight reduction alongside a deeper, more aggressive exhaust note without tipping into obnoxious drone.
HKS built the Super Turbo Muffler line around their turbocharged-engine tuning heritage, and the Ti variant takes that formula further by swapping in a titanium muffler body and tip in place of stainless steel. The result is a substantial reduction in unsprung/rear-mounted weight versus the factory muffler, which — combined with HKS's internal baffle tuning — delivers a deep, resonant tone at idle and cruise that opens up into a sharper, turbo-forward growl under load, all while keeping backpressure in check for a factory-turbo or lightly-tuned setup.
Construction highlights:
- Full titanium muffler body and tip — significant weight savings over OEM and over stainless cat-back options
- HKS-tuned internal baffling for a deep tone that stays livable on long drives
- Direct bolt-on fitment to the VAB WRX STI / VAG WRX S4 factory mid-pipe — no cutting or welding required
- Titanium tip finish that resists discoloration better than stainless under sustained heat
Whether you're running a stock-turbo daily or a mild-tuned STI/S4, the Super Turbo Muffler Ti is a proven, well-known upgrade in the Subaru community for drivers who want genuine HKS engineering, a real weight reduction, and a tone that sounds intentional — not aftermarket-loud.
