Im no expert on the BMW's but im about to get one, i am interested in putting money into the engine later on....its like 230 HP stock but does teh engine support turbo if i want to? and i dotn want the 135i, so dont tell me to get one...

What? There's a 128i? I am a car nut and the only ones for sale (cause I was looking at them like 1/2 an hour ago) were the 116i, 118i, 120i, 120d, 130i and 135i. Anyway don't bother get a real car like the Mazda 3 MPS or the Renaultsport Megane 225 Cup...awesome cars. Anyway most cars support turbo...but they are very bad for the engine performance in a stock car, you will need exhaust tweeks, engine strengthening, intercoolers and an updated CPU. Try a car that already has one like the ones I suggested and go nuts boosting them, as they already have turbos, just waiting for extra mods...