1500 is pretty cheap for the motor, but after that your looking at another 1500 for the gearbox ect so it all starts to add up,
do you have the knowledge and tools required to do the conversion yourself confidently? if not then leave it to the experts or im sure someone on the forums will give you a hand (i know f**k all so not me )
as far as im aware there are a few 32's with 25's in em w/o compliance, unless the cop that pulled you over knows the differences between the motors, there is no way in hell they can pick it apart