Your Mom drives a SRT-4? That's pretty badass.
From what I know from helping a buddy with his SRT-4, a wastegate actuator is a good, cheap upgrade. Those go for around $160. Holds stock boost without tapering down like the stock one does. That with a manual boost controller, you can turn the boost up. I think the max on the stock fuel system is around 17psi.
I don't own one, so I might be completely wrong, but that was what I remember from helping him.
Another thing that really helped was motor mounts.
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2005 WRX Wagon
Engine
- APS SR-30 Turbo
- Titek Bellmouth catted downpipe
- Borla Catback
- Boost Cooler Methanol Injection with VCS-25 controller
- GM Boost control solenoid
- Open Source tuned
Chassis
-Perrin Anti-lift kit
-22mm SPT rear swaybar
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