I'm going to be purchasing either an s4 or rs4 engine. I'm not sure if i want to buy the s4 engine and upgrade to rs4 standards OR simply buy the rs4 engine (and maybe modify from there if possible) and call it a day. What do you think would be best to achieve max power?

 

uuuhm, the RS4!?

 

so if i got the b5 s4 engine and tune it with all rs4 parts, would it be the same as an rs4 or more/less power than stock rs4 engine?