You can put the UIM from a re or rew on an s4 or s5 TII LIM with the right plate. Compression might not affect an n/a that much but when it comes to turbocharging a rotary, higher compression always yeilds wayyyy more power but ofcourse a hotter charge. And stock for stock, a 6port has bigger porting than a s4 or s5 4port. Don't forget RE's, and REW's are 32% slicker than s5 housings which ='s less friction,less heat. If you like being slow, that car would be perfect.