My downpipes need to be replaced due to the flex mesh being damaged during loading on a car hauler. I plan to upgrade the turbos,down pipes and cat backs. It's a b5 s4 2001. Without having to take out a loan what would be the best set up? Has anyone had good or bad experiences w certain brands? I just bought to car in February. I don't drive it yet. It's leaking a small amount of oil from what seems to be the turbos. At first I thought it was valve cover gaskets but there is no oil coming from around them. It smokes on both sides of the engine. Before I get it to a shop I'd like to purchase the items mentions above so I can do it all at once. Just figured I'd pick your brains before I pull the trigger. So far I've put on adjustable coil overs and some 18x9.5 w 235/40's and of course I've already ran into the fr caliper issue. (Nothing a die grinder couldn't fix) let me know if there are other mods that help w performance as well thank you for reading.