Treadstone Sti Turbo kit GTK 500-549
  • Treadstone Sti Turbo kit GTK 500-549
  • Treadstone Sti Turbo kit GTK 500-549
  • Treadstone Sti Turbo kit GTK 500-549

Treadstone Sti Turbo kit GTK 500-549




Product Description

Our STi kit has been re-released and upgrade from its original version! Turbo bracket has been reinforced, our oil catch can relocated, and flex joints put in to prevent cracks! Precision turbochargers are now also available! This is a 100% complete kit, and includes all hardware needed for installation.
All of our turbocharging compliment the best in performance turbocharging today! Turbonetics Precision, and Garrett Turbochargers, the pioneer in performance turbocharging! With the knowledge and experience of one some of the best names in turbocharging, Treadstone products parallels with quality and reliability, giving you the best products combination in performance turbocharging. With a no hassle one year warranty that cant be beat!

We are passionate about Subaru performance, and we stopped at nothing to make this one of the best kits available to the enthusiast. With many different turbo options, from standard bearing, to ceramic ball bearing, to the GTK turbocharger, performance options are endless whether your tuning for street, track or strip.

We can custom build a turbocharger to your specs, with turbine wheel size, turbine AR, compressor AR and compressor trim. Boost pressure is regulated by a Tial 44mm V band wastegate, combined with our double slip fit dump tube, installation is quite simple, compared to other kits on the market kits. Our stainless is made in the USA and hand welded to perfection, utilizing top notch quality parts throughout! Rotated turbo cold air inlet
Included with your rotated turbo kit set up is a cold air intake kit available in 4 color options. Suby blue, murdered out black, crinkle red and polished. Features a 3" aluminum mandrel bend for smooth air flow into the turbo. Precision welded MAF adapter engineered to perform, and placed downward of 6" of straight tubing for laminar flow through sensor. No erratic idling, or faulty readings, we tested and tuned this intake to run perfect. With a 3" inlet pipe you have greater tune ability to run larger injectors and meter larger amounts of air for high horsepower levels. Includes a large 8" long K&N air filter for the least restricted air flow into the turbo.

Also, available is an upgraded big MAF tube for horsepower levels above 550hp, super tunability with the big MAF intake kit. Our larger 3.5" Cold air intake supports up to 550 to 900hp with ease. The larger cross section at the MAF metering point gives you great tunnability for larger injectors and more effective air flow metering at higher horsepower levels!

Up Pipe and Downpipe
All of our stainless steel is hand crafted in the USA using USA made Rath 304 stainless steel, and hand tig welded to perfection. The up-pipe utilizes a 2" pipe with CNC precision cut stainless flange, and bolts directly to the factory exhaust manifold. The Tial 44mm wastegate is positioned perfectly to allow smooth exhaust flow into the wastegate for precise boost control eliminating boost spikes and creep. The downpipe utilizes 3" diameter tubing. The large diameter dump tube is routed far down from the turbo outlet to further eliminate creep and spikes, as well as making more power be decreasing back pressure in your downpipe enhancing turbo spool up, and increasing wastegate efficiency. The dump tube has 2 slip fit joints which makes turbo installation much easier than most other kits on the market, no hard to reach flanges, or clamps. And your able to change remove the downpipe, turbo or wastegate with out taking out the whole system. The downpipe will bolt up to any aftermarket or OEM cat back exhaust system.

Included in the kit
# 304 Stainless Up Pipe
# 304 Stainless Downpipe
# Turbo bracket
# Tial 44mm wastegate
# Rotated mount turbo inlet pipes
# Inlet Silicone hoses and clamps
# 8" Long Hi Flow Filter
# 1/2" Waterlines and fittings
# Oil supply line and fittings
# Drain flange and fitting
# Oil drain hose
# Hose clamps
# Vacuum lines and fittings
# All necessary hardware and gaskets


  • Model: TKSTIGTK500
  • 100 Units in Stock
  • Manufactured by: Treadstone


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This product was added to our catalog on Tuesday 30 November, 1999.