you arent going to get a garrett turbo and a manifold for 2k, 2.5-3k will get you a 6boost/ETM manifold and a gt35 but the GT30's are more expensive than the GT35's, unless you can get someone elses setup 2nd hand.
a racecar on a budget is going to break things, cheap stainless manifolds expect them to warp and crack, cheap nasty turbos, expect them to be extra laggy and or blow up.