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Twisted Steel Race Series Down-Pipe

Subaru WRX STI 15-18 H4-2.5L (t)
Part Number: 48-36801-HN
$591.72

MSRP: $721.61

Details:

  • In-house dyno testing produced gains of up to +22 horsepower and +37 lbs. x ft. torque *(Dyno test results are from P/N 48-36801-HC)
  • Unique fabricated bellmouth design for free flowing wastegate
  • Includes second bung for either a wide-band Oâ‚‚ gauge or auxiliary instrumentation
  • High quality laser cut flanges for maximum strength and durability
  • Designed to bolt-on in the stock location with no cutting or modifications required
  • 100% hand TIG-welded for strength and durability
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Overview

Add dyno-proven power to your Subaru with this Twisted Steel Race down-pipe which produced up to +22 horsepower and +37 lbs. x ft. torque, as measured on our in-house dyno *(Dyno test results are from P/N 48-36801-HC). Brush finished 304 stainless steel tubing improves exhaust flow to deliver increased horsepower and torque. The down-pipe is 100% hand TIG-welded and uses a unique fabricated bellmouth design that increases exhaust velocity and eliminates low pressure drops which helps to scavenge the exhaust for increased power. This direct bolt-on down-pipe requires no cutting or drilling for a hassle-free installation.

Performance Gains:
In house dyno testing produced gains of up to +22 horsepower and +37 lbs. x ft. torque *(Dyno test results are from P/N 48-36801-HC).

Race Version:
This down-pipe was designed as a "Race" version for added performance and a more aggressive sound.

Brushed 304 SS Construction:
This down pipe is constructed of 3" mandrel-bent, brush finished 304 stainless steel tubing for maximum flow and corrosion resistance.

Fabricated Bellmouth Design:
A unique fabricated bellmouth design increases exhaust velocity providing a free flowing wastegate.

Auxiliary Oâ‚‚  Bung:
This down-pipe uses factory mounting locations for the Oâ‚‚ sensor and includes an additional bung for either a wide-band Oâ‚‚ gauge or auxiliary instrumentation.

TIG-Welded:
100% TIG-Welded by certified craftsmen for race proven strength and durability. TIG-Welding provides the strongest welds reducing stress cracks.

Hassle-Free Installation:
All hardware and brackets are included for a hassle-free installation.

Legality:
This is a "Race Only" product used solely for competition. Its use is limited to closed-course and open-course racing that is formally sanctioned by a recognized racing organization. Any other use including recreational off-road use could be in violation of local, state and federal laws. This system is not currently CARB exempt and is not available for sale in California or for use on any vehicle registered with the California Department of Motor Vehicle.

aFe POWER down-pipe are engineered and manufactured in our Corona, California manufacturing facility.

Applications

Vehicle Applications

Year Make Model SubModel Engine Fuel
2015-2018Subaru Impreza WRX STI (Turbo) H4 2.5L Gas
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