• HKS [15-21 WRX/STI] Legamax Premium Catback Exhaust - JDMuscleCat Back Exhaust Systemhks31021-BF001
  • HKS [15-21 WRX/STI] Legamax Premium Catback Exhaust - JDMuscleCat Back Exhaust Systemhks31021-BF001
  • HKS [15-21 WRX/STI] Legamax Premium Catback Exhaust - JDMuscleCat Back Exhaust Systemhks31021-BF001

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Legamax Premium Cat-Back Exhaust

Fits: 15-21 WRX/STI

$1,99000
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Pay over time available · Est. $62.19/payment
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Illustrative estimate only, not a financing quote or guaranteed offer. Actual payments, frequency and terms vary by provider and eligibility. Taxes, shipping and add-ons are excluded.

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HKS Legamax Premium Cat-Back Exhaust
Fits: 15-21 WRX/STI
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Fitment

Please Note: Fitment: 2015-2021 Subaru WRX (sedan, 4D) and WRX STI (sedan, 4D) - per HKS application table (VAG/VAB chassis). Legacy description embedded a third-party page-scrape wrapper (SmyPerformance) and a YouTube iframe; rebuilt clean from HKS spec data. Not on sale at time of cleanup: $1,990.00. Price untouched.
  • 2015–2021 Subaru | WRX STI
  • 2015–2021 Subaru | WRX

Description

HKS Legamax Premium mufflers offer the performance benefits of a sports muffler with the class and elegance of a premium muffler. The Legamax Premium cat-back for the 2015-2021 Subaru WRX and WRX STI is a full SUS304 stainless steel system that bolts directly to the stock cat pipe. Smooth mandrel bends create obstruction-free flow: 75mm piping splits into dual 60mm sections feeding a pair of premium LM-shape mufflers with dual 90mm polished tips on each side. A 101.6mm silencer plus a silent chamber keeps the tone mature - the performance of 75mm piping without attracting extra attention. The result is improved throttle response, more horsepower and torque, and reduced turbo lag, with a refined exhaust note suited to daily driving.

  • Full SUS304 stainless steel construction with high-luster polished finish
  • 75mm center piping splitting into dual 60mm sections
  • Quad 90mm (3.5 in) polished stainless tips - dual LM-style tips per side
  • LM (Legamax Premium) muffler shape with silent chamber for a mature, refined tone
  • Close-proximity noise: 83 dB (HKS) vs 82 dB (stock) - barely louder than stock at idle
  • Lightweight design - approximately 35 lbs
  • Direct bolt-on installation - hangers welded at OEM locations; no modification required
  • Includes gaskets and installation hardware
  • Made in Japan
  • Manufacturer part number: 31021-BF001

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