as far as the interals are concerned i really dont have to upgrade any of it, i am not putting insane amount of boost through it, the forgies and valves are there only cuase they were a good price. i was looking for cams but wasnt able to get hold of any, but as i said its not needed i just thought while the engine was apart hey why not upgrade a few things, its mainly just to make it a little bit stronger for the few times i turn the boost up to dyno it and drag it. this is more of a daily set up as i have to drive the car 600km a week and more. as far as exhuast goes we will see closer as to how tight my funds are. really it would only cost me 200$ for the whole exhuast as my older brother can build them. so like i said if money is desperately tight then no i wont change it, if i have money spare i will.