havent done this myself mate but ive seen a bit written on it.
some people have cut there original throttle body off their stock plenum and had it moved to the front. personally, i dont think this is sufficient for flow purposes. the second pic shows this. as the stock plenum isnt flowed etc for a front facing, i dont think the air flow would be even going to all the cylinders. RIPS make an awesome looking front facing plenum
or you could always go for the GREDDY one and im sure there are more out there.
the only thing is that when you put this on, your intercooler piping needs to be changed. must people have cut a hole to do this.
i guess it will increase throttle response etc due to the shorter intercooler piping.
gl