Redrum14

I want to upgrade my turbos to k04s when mine go bad, but I am curious what else I MUST upgrade. I know all of the different available upgrades, but if i were to buy the k04s separate, what else do i need to run them effectively. My engine upgrades that I have so far are as follows:

APR stage 1 chip;
K/N drop-in (soon to be K/N+Darintake;
12 Piece Silicone Hose Kit;

I am currently trying to find a cheap Borla exhaust.....

SO then.... what do I NEED>>>>>

TwentyValveB5+S4

You can run K04s on K03 tuning, and since APR isn't very aggressive, you may not *need* anything else.

I would recommend an MBC in parallel w/ your N75, though, to cap boost and make sure you aren't getting too lean.

It won't run great, but it'll run.

What else you want to do from there is up to you.
STFA for "3-" and "stage 3 fueling" to learn more about what you need to maximize the potential of the K04s.

Redrum14

Eventually i would upgrade everything, but what i want to know is what needs to be done wit the k04s

TwentyValveB5+S4

those are hardly "mandatory"

Tooned27::DWGarage

Allegedly

Redrum14

.. MBC goes, does it have to be a specific one made for an S4 or can i use a standard aftermarket MBC.. and what would i limit my boost to... THanks

TwentyValveB5+S4

I'd start the MBC out at about 12psi. You may get underboost deviation codes, so you'll have to experiment. Find someone with ECUx or VAG-COM to log while you slowly crank it up.

The inlet pipes are separate from your silicon piping set; it's what goes from the silicon hose on the y-pipe to the turbos.

KillA6

Yea but I think he did some cutting and welding IIRC.

S40RCE:Smurf

In that case, like you said just inlet pipes, + hardware kit(~$75) + the things you stated above

Rudy H

I am going down this same path.
Just grabbed a Stage III- ECU and FPR.

Next time I tackle engine getting dps and intercoolers.

After that a decent exhaust, then finish with someones fueling kit