I don't think he needs to when his car is already running a 5120 551K file.
Which incidentally is what his car came with from the factory.

Let me see.
Options:
a) modify my 551K tune.
Or
b) take a 551M file, try to SOMEHOW make it work on an RS4, then retune from scratch?

Am I the only one who thinks a) is easier?

First of all i own an RS4 hens 551K file.
Second of all i am not running nobodys file. But my own. 
Third - Nyet you are a computer warroior. More power too you. You are the best - you Prick!!@
And leave me out your catfight.

Thank you Ddellinger. And thank everyone else for their input as well... I don't intend to use the maf scaling to lean out my A/F even thou reading thru my post it would appear as thou that was my plan. I am excited to be progressing and probably skipped writing the part where I'm going to tune my A/F to be suitable and then go to a bigger MAF. I know I'll likely have to retune them with it but I figure its good practice. I am disappointed in the general " I'm smart and your too dumb to be doing this" attitude I see thrown around here a lot. We all started somewhere eh? I figure that if I'm capable of doing my own ko4 install with timing belt, cam chains, and god know how many odds and ends I dealt with getting it put together then I'm competent enough to at least learn and build a tune. I wonder how many people are scared to ask questions because they get flamed every time someone who reads it decides " what a dumbass" and responds in a way that makes the op feel like they aren't capable. Now I understand that some of us truly aren't capable and that's fine too but who am I to decide that for them?

Thank you a bunch. We are all here to learn. And all the help is appreciated.
Robsa6:  Just do your thing man. Do not let anybody discourage you. You will get there.
Cheers.

Here's a list of maps I copied over from my previous m-box based bigish turbo file with a lot of success so far. Also included are some necessary maps for s4 throttle body. I'll post a "base bin" if there is interest.

Griff should have cam switch-over scheme for s4 cams on k-box as well.