[VF-Engineering]

Originally Posted by Ninjaneer34

I'm starting a thread to find the best mods to achieve conservative 400WHP for my 17 M2. I want to get top end gains. Please post your cars mods with the cost next to each, the dyno charts, and the dyno you used. If you have had any problems with CEL, limp mode, or boost lag, then please state the issue, (if you resolved the issue, how?).

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.