Anthony - instead of the W-A intercooler - you could use a front mount ? I vbelieve they are more efficient to cool - cause the W-a still sticks on the top of the motor ..
As talked over you can still get new group a bumpers from toyota + all the bits needed to put it on - but newies cost a good 750 or so for the lot at least .
power wise - the motors are near identical - its the ECU that gives the GRp A the extra Zip - and a stronger short ration gearbox - Which i know where there is one if you want to go to that extent