HKS Hi-Power Single Exit Cat-Back Exhaust - Subaru WRX / WRX STI 2015-2021

HKS Hi-Power Single Exit Cat-Back Exhaust - Subaru WRX / WRX STI 2015-2021

HKS SKU: HKS31006-BF003
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The HKS Hi-Power single exit cat-back for the US-spec 2015-2021 WRX and WRX STI replaces the factory quad-exit system with one right-side, bullet-style straight-through muffler. It uses 85 mm main piping and a 119 mm adjustable tail tip, built from SUS304 and coated SUH409 stainless steel. A removable inner silencer lets you tune volume: roughly 82 dB with it installed and 96 dB without. Minimum ground clearance at the mid pipe is 115 mm on stock suspension, and the system bolts on with no modification.

Specifications

Type Cat-back exhaust (HKS Hi-Power)
Layout Single right-side exit, bullet-style straight-through muffler
Piping Diameter 85 mm
Tip Diameter 119 mm, adjustable
Material SUS304 stainless steel / coated SUH409 stainless steel
Sound Level 82 dB with inner silencer, 96 dB without
Road Clearance 115 mm at mid pipe (stock suspension)
Part Number 31006-BF003

This part fits:

Year Make Model Submodel
2015 Subaru WRX All
2016 Subaru WRX All
2017 Subaru WRX All
2018 Subaru WRX All
2019 Subaru WRX All
2020 Subaru WRX All
2021 Subaru WRX All
2015 Subaru WRX STI All
2016 Subaru WRX STI All
2017 Subaru WRX STI All
2018 Subaru WRX STI All
2019 Subaru WRX STI All
2020 Subaru WRX STI All
2021 Subaru WRX STI All

Shipping

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  • Standard, expedited, and overnight options at checkout.
  • Oversized items ship by freight and take longer.
  • Special order items follow a lead time we confirm with you individually before the order is committed.
  • Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
  • Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
  • International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

  • 30 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
  • Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
  • Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
  • Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
  • Product images may be representative. The SKU and specifications in the listing are what ships.
  • Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty
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