You might need a drill.. Assuming the GTM core uses the same crossmember bracing that the Z1 core does.. Not a huge deal.. just take the bumper off (roughly 18 screws / bolts, 10 push pins) and a 10mm socket to unloosen the washer bottle a bit. Then route the lines, tighten down the bolts for the core, attach the hoses at both ends. Torque down the sandwich plate adaptor and you're good
. Go to Z1 and download their PDF for installation. Takes about an hour.. Good Luck