planning to do the whole sha-bang some time in the near future. im adding a cobb catted dp, cobb ebcs, and fuel pump, along with a already modded borla cat back and cobb sf intake on my 03 wrx. question is if i get that dyno'd could i add a catless up later without having to re tune? or would i have to do the up and dp at the same time? its more of a $$$ problem, so i might have to wait till' spring. any help would be coo!
@thekamikaze kid
The photo I posted in my earlier comment to this thread is an Invidia catless up-pipe, and it has a fitting built in for the O2 sensor.
The sensor is also show. I'd wrap the up-pipe as well, to help manage under the bonnet temps down.
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