Rev9 Exhaust for Subaru WRX / WRX STI Sedan GJ (2011-2014) 3" FlowMAXX Axleback - Standard or Track Version

Fitment Information

• Subaru WRX / WRX STI Sedan GJ 2.5L Turbo H4 (2011, 2012, 2013, 2014)

Specs & Features

• Stainless steel or Titanium pipe 
  
• Muffler:
  
  • Standard - with Muffler
    
  • Track - Muffler Delete
• Total weight of this exhaust: 
  
  • Standard with Muffler Stainless: 15 lbs
    
  • Track Stainless Steel: 11 lbs
  • Track Titanium: 6 lbs 
• Exhaust Pipe diameter / Exhaust Tip Size: 
  
  • Standard: 2.5" / 3" 
    
  • Track Stainless Steel: 2.5" / 3"
  • Track Titanium: 2" / 3"
• Offer Minimal Flow Restriction With Deep, Rich Performance Sound
• Installation Hardware Include For Simple Installation With Proper Equipment
• Fully Polished Double Walled Exhaust Tip

Product Description

The Rev9 FlowMAXX Race Spec Axle-Back Exhaust System for the 2011–2014 Subaru Impreza WRX STI Sedan was built for enthusiasts who think the factory exhaust is simply too quiet and too tame for a turbocharged boxer engine. Available in both premium stainless steel and lightweight titanium versions, this axle-back system transforms the car with a louder, deeper, and far more aggressive exhaust note while improving overall exhaust flow and turbo response. The straight-through Race Spec design reduces restriction to help the EJ-series engine breathe more freely, bringing out sharper throttle response, louder turbo spool, and that unmistakable Subaru rumble enthusiasts love. Whether you’re carving through mountain roads, hitting weekend meets, or doing the occasional tunnel pull “for research purposes,” the sound delivers the perfect balance of raw aggression and turbocharged personality.

Built with mandrel-bent piping and precision TIG-welded construction, the Rev9 FlowMAXX exhaust system is engineered for durability, heat resistance, and long-term street or performance use. The stainless steel version delivers excellent durability and a deep performance tone, while the titanium setup adds weight savings and a sharper, more exotic race-inspired sound profile. Rev9 has become a go-to brand for enthusiasts looking for aggressive styling, proven fitment, and real sound improvement without spending premium boutique exhaust money. If your WRX STI feels too restricted from the factory and you want the car to sound more alive every time boost kicks in, the Rev9 FlowMAXX Race Spec Exhaust is the upgrade that finally gives the car the attitude it deserves.