Had the A4 for 3 years now, ready to start having some fun with this thing. Looking for some advice on what I can do to slowly increase my power, cost effectively. I would like to have exhaust, intake, inter cooler, and ECU upgrade. Eventually I would like to move on to the Ko4 turbo upgrade from APR. I would like to ease into that option because of the price. Also, that would require multiple upgrades at once. Can someone please offer suggestions about what to get and possibly the order in which to increase mods. Id like to gradually experience each mod to see how it suits my daily driving. Thank you in advance for your help.