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Originally Posted by scoobanader
So should i do the ECU reflash?
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Well, so far, the only mod that will guarantee no boost creep is porting the wastegate. Otherwise, freeing up the exhaust all the way, and making significant increases in air movement will lead to boost creep, which can really hurt the engine, as it starvs for fuel.
Now, retaining at least one cat will help prevent boost creep, but that's not a guarantee. At our altitude, I'd be willing to run a Turbo back with 1 cat and take my chances. However, at sea level, the car may have issues.
I think the best formula is to run an ECUtek reflash with a turbo back retaining at least one cat, maybe 2? ...
Check out this
threadfrom NASIOC. It has some great technical discussion on the matter.