*Note – At this stage if you want to run an aftermarket intake combined with an aftermarket downpipe, we recommend installing one of the following parts to help with mechanical boost creep. With 93oct you can expect an additional 5-10 hp over 91oct. We were able to gain 49 HP at 4100rpm tapering to 34 HP increase at 5500rpm. We saw a 34 HP or 16% increase in peak power and 63 FT LB or 29% increase in peak torque.
We performed a custom tune to 19psi on 91oct. An additional benefit is that it makes the COBB 3" Downpipe compatible with any cat-back exhaust that mates to the factory cat section.This stage includes all the parts of Stage 1 with the addition of a Grimmspeed Downpipe and external wastegated uppipe.
This provides an improved seal compared to other methods, as well as reduced noise. The end piping tapers down to a flange that uses the stock donut gasket and factory spring bolts to aid in flex, longevity and proper fitment. All tubing used in the fabrication of this downpipe is 304 stainless steel for increased corrosion resistance. A second O2 sensor bung is located immediately after the cat to be used by the second OEM O2 sensor. It also reaches operating temperature faster than other style cats for cleaner cold-start emissions. This one piece 400 grade stainless steel cat has a much higher flow rate and longer lifespan compared to ceramic or "brick" style cats. A custom spun metal substrate high flow catalytic converter comes next. The outlet flange is configured with an O2 sensor bung to accommodate the stock O2 sensor. The shape of the outlet flange smoothly blends the turbine outlet and wastegate gases. The engineering that went into the COBB 3" Downpipe started with the CAD designed investment-cast turbine outlet, made of 304 stainless steel for enduring corrosion resistance and reduced heat transfer to the engine bay. The COBB downpipe, combined with our Accessport engine management, is one of the most easy installations for any enthusiast looking to unlock the true potential of their WRX. This metal substrate cat is highly efficient, allowing the exhaust to flow much easier than the factory unit ever would. The design permits the air to flow with very little turbulence to the single high flow catalytic converter. The COBB Tuning downpipe begins with the CAD designed bellmouth that directs the air coming out of the turbo.
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