Does anyone know if the 06 wrx has a cat in the uppipe? I read somewhere that the fxt has a pre cat.

 

I believe it has some type of air pump instead of a cat. Not sure if I'm going to bother getting an up until someone dynos one.

 

Hello?

 

Like the STI model, there is no pre-cat in the uppipe on the '06 WRX. The '06 WRX now has an air injector pump driven off the engine like another accessory. This was mentioned in the Subaru Drive Performance publication. This cleans up emissions without the chance of catalyst particles disintegrating and finding their way into the turbo.

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0==WW==0
"…axles of evil…" - george w. bush

 

nice reply, thanks WW!

 

Thank you !

 

Will This reduce power in the 06 model

Im contemplating buying an UpPipe for the 2006 wrap it, install it. Screw the air pump? or am I just wasting my time?

 

2006 WRX uppipe is already catless. Money is better spent in other areas first - engine management, for example.

Air injection pumps take a few horsepower to drive them but help quite a bit to clean up emissions without affecting driveability, unlike the factory method of tuning U.S.-market cars. Probably doesn't require any more power to drive than air-conditioning. Air is pumped through nozzles, usually located close to the exhaust port in the exhaust manifold on most engines. What this extra dose of oxygen does is to help ignite any residual unburned fuel and cause the exhaust temperatures to go up somewhat, allowing the catalytic converters to achieve light-off temperature so they can do their job.

While excessively high exhaust gas temperatures are used as a lean air/fuel ratio indicator, the addition of an air injection pump shouldn't raise it too much.

You want a turbo engine's exhaust to be as hot as possible without running the engine lean or melting components. A hotter exhaust means the gasses contain more energy as they expand. This is why manifolds are sometimes heat-wrapped or thermal coated. This pressure is what spools up the turbo.

I'd leave the air injection pump and related hardware alone and allow them to do the job they were designed for. The power loss is minimal and the loss of the pre-cat in the uppipe is a welcome trade-off, IMO. You can remove it if you are building an all-out track car where you'd be stripping weight out of the car and using aftermarket headers, anyway. Also, in CA and some other states a vehicle with the air pump removed or disabled will fail the visual part of the smog inspection.

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0==WW==0
"…axles of evil…" - george w. bush