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Discussion Starter · #1 ·
I have a wrx that is custom tuned to a invidia downpipe. I have retained the standard car back.

I gather this is basically a stage 2 car.

If I now fit a cat back will I need to retune? As the dump pipe is no longer the restriction would this cause overboost or lean conditions?
 

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You will not need to remap for the catback.

You should stick with the OEM cloth filter if for only better filtration.
 

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Discussion Starter · #4 ·
You will not need to remap for the catback.

You should stick with the OEM cloth filter if for only better filtration.
Hi thanks for reply. I called the tuner up and he said he has to retune as it will overboost?? Maybe as it’s tuned to downpipe and now the cat back exhaust is the restriction? Whereas with stock downpipe the cat back would not be restriction?
 

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I'd listen to your tuner.
 

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Discussion Starter · #6 ·
I have read plenty in here that say cat back requires no tune? Including in this thread.

But my tuner says otherwise? Confused
 

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Only your tuner knows the methodology by which he/she mapped the ignition, fuel, etc.

What others say on these forums (or other forums) is irrelevant.
 
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