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Commercially available exhaust systems are few and far between. It's not that they don't exist, it's just that most vendors don't even know what is available for the All Trac/GT-Four. We have listed for you part numbers, and some thoughts that might help you decide which is best for you. A separate ST165 version of this page will be made later.
If you have questions about making your own exhaust system, visit here: EXHAUST FAQ
| Brand | Pipe Size | Material | Coating | Braced? | Cost | Notes |
| Greddy | 3" | Steel | Aluminized | No | $199 | Does not replace turbo elbow |
| Blitz | 3" | Cast Iron | Thermal | OE Braces | $395 | Does not replace turbo elbow |
| Top End | 2.75"-3" | Steel | Hi Temp Paint | 1 Brace | $325 | Screw in style o2 sensor |
| Trueleo | 3" | Steel | Baked Coat | No | $250 | Painted version, $225, OE style o2 |
| KORacing | 2.5" | Steel | Ceramic | No | $295 | OE style o2, optional 2nd o2 |
| Aussie 3" | 3" | Steel | HPC option | No | $300 | 2nd o2, comes with ALL gaskets |
KORacing Downpipe
e-mail: sales@koracing.net
PRO: 2.5" fits better with stock midpipe and good for street
CON: Price went up
Custom MR2 downpipe (not yet tested with st185)
2.5" mandrel bent (3 piece)
Mild steel construction
Laser cut flanges
Uses OEM style o2 sensor mount
$275 w/ ceramic coating (OEM o2 sensor style)
$15 extra for extra o2 bung
$20 shipping
Aussie Downpipe
website: www.aussie-speed.com
PRO: Amazing pipe size and smooth looks, 3" nice fit, higher flow gaskets included
CON: Blocks oil filter (st165)
3.5-3" mandrel bent (3 piece)
Mild steel construction
Uses OEM style o2 sensor mount as well as secondary o2 port for tuning
$325 shipped with HPC coating
Ready to buy? Consider our site sponsor, www.935motorsports.com
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| ST165 DP | ST185 DP |
e-mail:
topend@racetep.com
Custom st185 downpipe
2.75" to 3" mandrel bent
Mild steel construction
Includes new o2 sensor (requires custom wiring)
$325 ($400 after modification)
PRO: Always in stock if you need something ASAP, includes new o2 sensor and cheaper style o2 flange
CON: Boost spikes on some cars
*Note some have complained of boost spikes due to the lack of space around the wastegate area. To solve this problem you may have to modify the pipe to allow the wastegate door to swing completely open. Here are some pictures of a Top End downpipe that has been modified to work correctly.
Trueleo Downpipe
No Longer Sold, information will remain for reference
PRO: Inexpensive, higher flowing 3" for maximum HP
CON: Not braced, flange not laser cut
Custom ST185 downpipe
3" mandrel bent (2 piece)
Mild steel construction
Uses OEM style o2 sensor mount
$250 w/ ceramic style baked paint
$225 w/ hi temp paint spray
$??? shipping
Offroad pipe (diffuser), primary cat replacement
PRO:
Cast iron for extreme durability, full 75mm outlet, smooth internals for
maximum flow.
CON: Expensive, only replaces catalytic converter.
$395 Retail, Fits ST165, ST185, ST205 PN#
Trust 75mm Downpipe (cat replacement)
PRO: Less expensive than Blitz unit, Full
75mm outlet.
CON: Special order only, 3" outlet mated with
stock midpipe will cause turbulence.
HKS Offroad downpipe
This unit is no longer made or sold. The picture here is basically a reference and shows how simple it can be to make a cat replacement pipe. Assuming making a copy cat top flange was about $35, the entire unit could be done for $150 or less.
Do it yourself??
ST185:
Here are a couple of custom down pipes that were made as a one time only type of product. Anyone with enough time and patience can do this. As you can see you basically need the flange that goes to the turbo, and the appropriate piping *preferably stainless steel*. As you can see by these pipes, several small sections had to be welded together to make the shape and fit correct. Ask either one of these two people and they just might say they would never do it again!
Want to make a downpipe? Here are your turbo flanges! The 4 bolt is ST165, the 6 bolt is ST185/MR2. They are available for $35 each. Email Us.
A custom downpipe made at home. This one is also from Australia. Boy they really know how to do it down under! (ST185/MR2)
