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!?

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2005 Black S4
2001 RC51 Honda track tool (www.rc51.org)
2006 Softail FXST project toy
1990 500hp+ 454SS chevy p/u (www.454ss.com)
1998 Land Rover Disco crawler (www.discoweb.org)

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?