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uppipe question

3K views 6 replies 6 participants last post by  nagyhead 
#1 ·
I have a 04 wrx with the catted uppipe, If i was to replace just the uppipe without replacing the downpipe yet and without a tune would it cause any issues? sorry if theres already a thread asking this I couldnt find one.
 
#5 ·
Removing the cat in the up pipe is more for safety than anything else. That way if the cat decides to go, there whont be chunks going through your turbo. If you change it for a catless one you will be fine.
 
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