this is what i plan on doing, if you are going 190kw 6-speed into a 175 4sp everything seems to be plug and play, got a few more things to check in my manual, but only one harness needs to be changed (easy one) and a reflash with tech to to link the bcm with ecu and pim, and change the instrument cluster software aswell,
if you where going 4sp to 5sp, seems you will need to rip the dash out as the wiring is a wee bit different