DR Series 3.5"
Turbo to Tip Race Exhaust
 

   

"the fastest car ever recorded by our Correvit, pulled 1g in acceleration off the line, quicker than a $300K F355 Ferrari!"  

Motor Magazine  

 

 
 

 

Take No Prisoners!

APS DR Series 3.5" Turbo to Tip Race Exhaust
The worlds first bolt-on 3.5" Stainless Steel (304) turbo to tip race exhaust designed for 600+ horsepower. Minimal exhaust back pressure, fast turbocharger spool-up and maximum horsepower is guaranteed.

The APS DR Series 3.5" Turbo to Tip Race Exhaust is a true 3.5" internal diameter exhaust system through each and every section. By utilizing the latest technology precision mandrel bends with the smallest possible bend angles spread over the maximum possible length, optimum exhaust gas flow minimum exhaust back pressure is achieved.

By dissipating the hot exhaust gasses more efficiently, the APS DR Series race exhaust lowers the thermal load on vital engine components such as pistons, combustion chambers, valves etc., particularly at high horsepower levels. Another significant benefit of the DR Series race exhaust is better transfer of exhaust gas energy to the turbocharger which results in faster turbocharger spool-up and more efficient turbocharger operation at high power levels.

A great deal of development effort has also been put into accentuating the deep Subaru boxer engine note - this exhaust is not for the faint hearted and guaranteed to excite!

The comprehensive APS DR Series 3.5" Turbo to Tip Race Exhaust system includes the innovative APS High Flow Turbine Outlet manufactured from Ni Resist iron, 3.5" internal diameter 304 grade down pipe, 304 grade 3.5" internal diameter intermediate pipe with true 3.5" internal diameter resonator, Highly polished 304 grade 3.5" muffler and tip assembly, all mounting hardware, gaskets, stud, nuts etc. for easy installation.

Part No APSWRX-HOE/R5 Suites:

All US Specification WRX and STI vehicles

Australian Specification 1997 - 2005 model WRX and STI vehicles

NOTE: Installation of this exhaust system may affect exhaust emissions. Consequently, APS recommends this system be installed in vehicles intended for off-road or competition use only.

Click Here for information on how Dyno-Comp relies on this precision crafted APS product to build what is arguably the ultimate Subaru high-performance sports car.

Selecting your APS Exhaust System

"How much horsepower will that exhaust system add?"

This is an often asked question, to which there is no real answer. An exhaust system is only a point of possible restriction, which needs to be reduced as required.

For example, in a best case scenario, total removal of the complete turbo back exhaust system from a stock MY01 225 hp WRX will result in a power increase of approximately 20 hp. On the other hand, on a 425 flywheel hp WRX, utilization of the correct exhaust system would literally represent 65 of the 200 hp increase over standard.

A good starting point for the correct choice of an exhaust system, the following should be used as a useful giude:

  1. Street Use - Legal Emissions/Noise - Less than 4.0 psi back pressure
  2. Street Use - No Legaility Issues - Less than 2.5 psi back pressure
  3. Race Use - As low as possible, however no more than 1.0 psi back pressure

The following chart provides exhaust back pressure data for a given engine power level for the stock WRX exhaust system as well as the range of APS High Output exhaust systems.

Selection of the correct WRX or STI exhaust systems is the appropriate combination of back pressure, catalytic convertor and noise to suit the engine's power output.

Exhaust System
Back Pressure (psi) at Nominated Engine Horsepower Level
225hp
325hp
425hp
525hp
625hp
725hp
Stock
with Cat
12.0
-
-
-
-
-
Stock
without Cat
-
-
-
-
-
-
APSWRX-HOE/R2
with Cat
2.0
3.5
6.0
12.0
-
-
APSWRX-HOE/R2
without Cat
0.5
1.5
3.0
4.5
-
-
APSWRX-HOE/R1
with Cat
2.0
3.5
6.0
12.0
-
-
APSWRX-HOE/R1
without Cat
0.5
1.0
1.5
2.5
3.5
5.0
APSWRX-HOE/R8
with Cat
2.0
3.5
6.0
12.0
-
-
APSWRX-HOE/R8
without Cat
0.5
1.0
1.5
2.5
3.5
5.0
APSWRX-HOE/R5
with Cat
-
-
1.0
1.5
2.0
2.5
APSWRX-HOE/R5
without Cat
-
-
-
0.5
0.75
1.0

Click Here for video action of the US Spec APS STI fitted with APS High Energy Headers and APS 3.5" Race Exhaust

Hint: Save to disk before playing video