Quote:
Originally Posted by VF-Engineering
This is absolutely achievable with the stock turbo, but not necessarily
a guarantee since it really does put you very close to the limits of the
stock turbo (rotational speed and efficiency) as well as the limitations
of the stock fueling system.
Depending on the dyno you can manipulate the settings and correction
factor to show a 400whp run, but what you really want to see is a delta
proving an increase of approximately 70-80 WHP w/ just bolt-on's and
a tune.
For reference, here is a our HEX Tuning Stage TWO with just downpipes.
Software Level: HEX Tuning Stage TWO
Additional Mods: ER Downpipes / Stock Cat-Back
Fuel Level: 91 Octane 
Add a cat-back, turbo inlet pipe, and an inter-cooler; and you're as
optimal as you're going to get.
Keep in mind that chasing a number, or forcing the car to make more
power that it really wants to make, is a recipe for inconsistent power
delivery, or worse. It's more about finding the right equilibrium for your
own intended use, than it is about just putting down a large number on
an ambiguous single-run dyno plot.
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Respectable gains btw! Do you have this Dyno in SAE or STD please ?
Thanks