^for 4 grand your best bet is to hunt down a more or less complete kit that's used (like sam's). otherwise you're really not going to have enough for it...
let it be known, however - you need to go ahead and plan ahead to be able to pay for little things that might (probably) break and any/all associated costs. honestly, you need to have double the money of a kit saved up JUST IN CASE the absolute worst happens. (see my carnage thread for an example).
if you run the car conservatively and don't drive like me (like you stole it) i'm sure you'd be fine. I just don't want you to have the impression that you'll have a worry free car just because a lot of things on it are new and that you'll be able to just drive it care-free. upkeep on a heavily modified car can go above the normal call of duty, so just be prepared.
that being said, i've driven my car ALL OVER the damn place since the new motor and 3071 - and have had no real issues. Small hiccups yes, but it's never left me stranded.. the car can and by all means probably will retain most of its reliability. Like i said though, just be prepared.
Looking at what sam has for sale (if you were to go that route) you'd also NEED:
a clutch (choice is up to you, kits w/flywheels range from 700-1600+ you can have your stock flywheel resurfaced to save money) plus install labor (the cheapest i've ever seen quoted is 350-375)
a better intercooler (price varies on this as well, i suggest cruising the classified - but honestly it's better to NOT cheap out on any part of a build like this.) an ER comp would suit you well, contact greg or mike @ dth to speak with them more about this.
the rest of the exhaust (after the test pipe in sam's kit) - this is up to you. custom, kit, whatever you decide. price varries a little to much for me to really give you an idea... used and local is always the best though if you're not having one made. this part you can do a little independant research and searching on - i'm sure you'll find something for a good deal.
outside of those big three, there are a few things that i HIGHLY HIGHLY recommend you get while you're at it - however they're not "necessary"
a different TIP. the one sam has for sale would work - but those things have claimed a few turbos' lives in their day. they have a set screw which is notorious for working their way loose and could destroy your turbo. Neuspeed makes a good one with a 3" inlet, you can find it various places online - classifieds would be a good place to start since you're on a budget.
suspension/brakes - again, not really needed persay.... but they could mean saving you or someone elses' life if you get caught in a bad situation. it is very easy (especially when you first get the car running) to mis-gauge how much room you need to stop when your car is that much faster than it used to be (and was intended to be). your stock setup isn't technically meant to handle that kind of force - and it is a good idea to just be on the safe side. B5S4 brakes are good for a budget, and will give you plenty of "one time emergency stopping power". for the track? maybe not so much... but it can't hurt. suspension is up to you - springs and shocks are a good start - that'll run you around 700 brand new.
a vag-com, the time to learn to use it, and maybe a SPS (if you go with REVO). those are important... if you plan to up your boost, timing, or to just check on the car and make sure it's running safely - you'll need the first two for sure.. and the third if you plan on milking the setup.
there's a few other things i could throw in there - but that's a good start. to really get into exactly what you should look for we'll need to know more about your intentions, the kind of power you're looking for, how you drive normally (including how much you drive the car), etc. it's really a decision that should be based upon your lifestyle if this is your only car... if you have a daily other than the a4 - just go balls out with it now and save yourself the hassle/extra money down the road lol
oh, and don't forget to factor in labor for installing this stuff if you're getting a shop to do it... but with your budget it doesn't look like that's really in the cards for you. i can honestly tell you that it's worth it to sit down with some friends and try your best to plan out the install - then just do it. you'll learn a lot about the car and be much better off down the road (for the hiccups i talked about) because of it.
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