When i bought my e 01 i saw presure sensor harneses are these a better solution than a new maf sensor? or will i still need a new maf sensor and if i do still need one which one should i get and where can i get it? Also i recently bought a set of the 550cc injectors will the stock fuel rail comply as far as volume?

 

Also at what horsepower will i have to start changing internals and where is a good source for internals ?