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can i put my stock exhaust on with my aftermarket downpipe? in other word do i have to have an aftermarket cat back to support the dp? also is there any difference in pipe size between the wrx and sti stock exhaust?
 

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The short answer: yes. As far as the fitment it depends on the manufacturer. I have the Cobb TBE - it is compatible with the OEM CB.
 

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what other dp are compatible with the stock exhaust?
Most aftermarket systems are 3" in diameter. Look for those that taper to 2.5". I cannot think of any of them top of my head. I know Invidia are quite popular - not sure of the taper.
 

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The stock and Cobb DP:

 

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so the downdipe has to taper to 2.5 to make it compatible with the stcok exhaust
Correct. The angle of the image does not show the taper very well.
 

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You are welcome. :)

I would expect more responses from those who have first hand knowledge of other DPs that taper to 2.5".
 

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Take a look at the shadow from the Cobb just before the outlet. You can the very top of the fitting as well.
 
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