Exhaust› Exhaust Pipes, Systems and Components

HKS

HKS 87-93 Supra MK3 Downpipe

$291.00

SKU: H005 3103-RT003

In Stock
In Stock
Ships by Oct 30
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The HKS 3103-RT003 is a 304 SS downpipe designed for racing use. It features mandrel bent construction and is a bolt-on application. This downpipe can mount to the stock turbo or an HKS turbo upgrade kit.
Show original supplier description

Part #: 3103-RT003

Vehicle Symptoms
  • slow turbo spool and laggy throttle response
  • exhaust feels restricted at high RPM
  • reduced power after catalytic converter clogged
  • rotten egg smell from failing catalytic converter
  • high exhaust backpressure and heat under car
Diagnostic Codes
  • P0234 – Engine Overboost Condition
  • P0420 – Cat Sys Efficiency Below Threshold (B1)
Relevant Conversations
  • HKS 3103-RT003 Supra MK3 downpipe review
  • 87-93 Supra turbo downpipe install guide
  • 7M-GTE slow spool fix aftermarket downpipe
  • Supra MK3 P0420 catalytic converter replacement downpipe
  • HKS downpipe vs stock Supra MK3 dyno
  • MK3 Supra catless downpipe boost creep P0234
  • HKS 3103-RT003 75mm downpipe fitment stock turbo
  • Supra MK3 exhaust upgrade downpipe and turbo spool
  • where to buy HKS Supra MK3 downpipe
  • MK3 Supra downpipe installation time and tools

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandHKS
Part NumberH005 3103-RT003

Videos

About MOTORMIA

5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy