You'll need springs and won't do 500 on a stock 3" MAF, let alone a stock AUQ one.

Lol.

This all sounds very noobish.
Start with a xls sheet and add all the parts with prices you think you need.
Start reading S3 Big Turbo Build Threads on audi-sport.net or what ever is best board for this kind of builds in your country.

Sum it all up and think about it some days... can is do thins in my parking low with all the rain and snow 

Well that's why I'm asking here because all I seem to get is mixed results when looking through different forums and threads. It's like youtube comments. More people arguing about how your "figures are wrong" and "you wont make those figures from this turbo" etc.

Sorry if it sounds noobie but I thought that's what "Noob questions" was for. And that there are no wrong questions only wrong answers?

Basically I've maxed out my k03s and my current setup. And I'm trying to find out what would be the best bang for buck turbo upgrade while still having a drive able car that spools before it runs out of revs.
And I'm not worried about whether I can do it on my driveway. I've had the head off twice and changed the clutch on my own last week. So I'm not scared to pull it apart and rebuild it properly.

As for my list, if I'm going k04 hybrid.

255 in line pump, 550cc injectors, rods, 3" maf housing, plumbing intake/exhaust and a new clutch when it shreds the new standard one

Unfortunately I live in North Wales. There aren't any big turbo 1.8t's around here, and with the Draconian laws in place here because of all the tourists. I can't even travel locally.

Rod's will definitely be a priority if I do go big turbo, and like you said it will also drop c.r.

I'll give you some info on what I'm looking for if you think it will help people to help me make the right choice.

To be honest my car is pretty perfect for me and my driving style. I'm not one of these people who throws his car into the bends at 100+ mph, and I barely break the speed limit. I just like how fast it rips from 0-100 but it's lacking that oomph after 5k rpm. The more I think about it the more I feel I'm left with 2 options.

Buy a standard k04 and 225 injectors and if needed the 3" maf housing. This way I could copy over the injector and compressor maps and could tune it myself, with a little help from the forums for re-scaling my MAF.

Or do the same with a k04 Hybrid, which I know would require rods, bigger fuel pump, and probably 550's. On top of everything else required for a standard k04.

I will definitely be looking in to this. Am I right in thinking that setup would be with a standard 064 and not a hybrid. And of course I will be doing rods and clutch first if I take this option. Thank you.

Just done some research on the Stroker kit. £1000 for a Crankshaft. Oof.

Thank you for all the advice so far. This is why I love this forum. And if it wasn't for the time and patience given by people like you. I don't think I'd even still be in to cars.

When I first got the car it was a mess. Warped cylinder head, worn springs, lacquer peel everywhere, more worn out parts than working ones.
Since then I've done it all and now it's a really nice car and I've fallen in love with it. It pulls really well and with the help of you guys. I managed to plug it in myself and I'm running around 20 psi with a hard cut at 7k and some lovely sounding overrun pops.

I'm just getting used to the power I think, which is why I'm contemplating bigger turbos.

I've installed a 3" decat downpipe, but I haven't done a front mount yet. So I figured I'm in a good position to pick up a second hand k04 and some 225 injectors. They even do an adaptor to make my downpipe fit the k04, and I already know I can copy over the 225 injector map into my 180. So I'm not worried about that either.

My main concern is that I wont be able to scale my maf into a 3" housing. And if I'm taking it somewhere to be done properly, then I might as well do the rods as well so they can really turn it up.
I always thought that the k04 ran out of puff at around 285 bhp or so. But I was talking to a guy on the seat forums and he has a 225 with rods and 550 injectors, and he came out of an R-Tech session with 309 bhp. So I guess the injectors run out of duty before the turbo does. Btw, it was an original 15 year old k04, not a new one or a hybrid.