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HKS Hi-Power Exhaust 2002-2007 WRX / 2004-2007 STI

by HKS
SKU 3106-EX008
Original price $630.00 - Original price $630.00
Original price
$630.00 - $630.00
Current price $630.00

Here, you are looking at the HKS Hi-Power Exhaust for the 2002-2007 WRX/STI. 

This catback will fit both Sedans and Wagons without an issue!

Inspired and designed from endurance and GT racing in Japan, HKS developed its Hi-Power Exhaust system for turbocharged applications. HKS has incorporated this new race-inspired offset muffler and piping design into many street applications, which offers a greater flow and higher PRM power gains due to the less restrictive design. This is achieved by eliminating unnecessary bends for the straightest exhaust path. 

Does not clear on vehicles with optional Subaru skid-plate (rear differential).

Key Details:

  • 75mm Piping
  • 120mm Tip
  • 304 Stainless steel construction 
  • Black coating throughout piping to prevent corrosion 
  • Minimal bends make for a smooth flow, increasing performance and sound
  • Improved throttle response
  • Reduced turbo lag
  • Deep tone
  • Gaskets and hardware included

Customer Reviews

Based on 1 review
Perfect balanced

Ordered this exhaust to have something a little more tame compared to my nur spec cat back. This exhaust is perfectly balanced being that it isn’t too loud at idle but sounds good when driving or doing pulls without being overly loud. I paired this with a tomei equal length header and grimmspeed divorced downpipe (catless). This was my 3rd cat back and I finally achieved what I was looking for in sound! Highly recommend for daily drivers


Thank you for your 5 Star Review of the HKS Hi-Power Exhaust for your WRX/STI! We appreciate your feedback on how this exhaust provides a perfect balance of sound. It is great to hear that it is not too loud at idle, but still sounds impressive during driving or acceleration without being overly loud. Pairing it with the Tomei equal length header and Grimmspeed divorced downpipe is a great way to achieve the sound you were looking for! Your recommendation for daily drivers is valuable! Rumble on!


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