the r34 smic can handle at about 230kw atw.
If you are keen on holding onto the smic, look into water-spray kit for the smic.
http://www.mearcat.com.au/Kits/
by lowering the temps of the smic, this should allow you to gain more power.
Although, dont get caught with no water and a higher tune hehe
Thinking of installing the water-kit to my r34 smic on my r32.