fisrt off listen to Vito, 3" dp and 3" exhaust with a test pipe for sure! If you are going to upgrade your fuel do it all, not a fuel rail OR injectors. you need both of those, if anything get the injectors though. other than that it looks to me like you still have some research to do on manifolds and what not, Keep researching and dont buy crap parts! thats the best suggestion i have! good luck