I wouldn't do it, but with the stock exhaust on you are less likely to do harm.  Is there a TuneEcu tune for your set up, or something to get you in the ballpark?  If there is a PCIII map just import it into a stock tune and load it with TuneEcu.

 

If it makes you feel any better, I have seen someone run triple filters and Jardine exhaust with stock fueling.


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