2004 Subaru WRX Wagon - Power Pages
2004 Subaru WRX Wagon
Text By Richard Fong, Photography by Richard Fong
| 2000 to 3500 HP range: 0 to 4 | 2000 to 3500 TQ range: 3 to 7 |
| 3500 to 5500 HP range: 2 to 6 | 3500 to 5500 TQ range: 5 to 7 |
| 5500 to redline HP range: 5 to 8 | 5500 to redline TQ range: 2 to 7 |
| Peak HP 220.9 | Peak TQ 226.6 |
Temp
Air temp @ 68 Degrees FahrenheitTemperature difference from previous
run: +0 Degrees Fahrenheit
Dyno 3
5zigen Miracle
Fireball Exhaust
229.8 Hp 236 Tq
Pros
This stainless system is as straight through as one would imagine and is incredibly light. Its larger diameter piping allows much more exhaust flow and helps the turbo breathe easier. We realized a gain of 8.9 hp throughout the power curve. This system also employs hollow hangers to further shed weight.
Cons
A straight-through design has drawbacks: It is quite loud and may attract unnecessary attention from those who issue fix-it tickets and speeding citations. If you're driving daily, you'll probably want to use the included silencer.
Notes
This exhaust uses a slip-fit-pipe design. It's actually easier to line up than a traditional flanged pipe and reduces the overall weight of the exhaust. 5Zigen created a light yet durable exhaust without using titanium.
Parts
Stainless-steel B-pipe, stainless-steel muffler, gasket, bolts and instructions
Tools
14mm combination wrench, 14mm socket, 12mm wrench, ratchet and WD-40
Installation Time
30 min
| 2000 to 3500 HP range: 2 to 3 | 2000 to 3500 TQ range: 2 to 4 |
| 3500 to 5500 HP range: 3 to 6 | 3500 to 5500 TQ range: 4 to 8 |
| 5500 to redline HP range: 2 to 8 | 5500 to redline TQ range: 6 to 9 |
| Peak HP 229.8 | Peak TQ 236.0 |
Temp
Air temp @ 68 Degrees FahrenheitTemperature difference from previous
run: +0 Degrees Fahrenheit
Dyno 4
Injen Stainless-Steel Downpipe Turbo Xs Manual Boost Controller256.2 Hp 231.0 Tq
By Richard Fong
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