Salam, i own a 2004 vitz and it has the stock auto tranny and the 1000 cc engine. i have changed the muffler but not the piping. i plan to change the piping and transmission. The cars engine has run 272000 km or so and its on CNG. i plan to change the engine to 2szfe soon but since my budget is low atm so i m thinking of goin for tranny and piping. Anything else i need to keep in mind? Please be kind to me since i m not only a newbie but a student who has very tight budget. =)