Plusdaddy

Hello yall so I have a 03 350z that has 255/40/18 in front and I知 at 660whp and looking at some MT street tires .. I have a set of 15in rear wheels I知 going to use but my question is , if I have a stand alone ecu like infinity do I need to worry about staying within 3%? I want to get these 295/65/15 rear tires and keep my front for on street but that痴 15.8% difference . Front being 26 ht and rear 30 in diameter.. I don稚 mind cutting the oem vdc wire under the center council because my aem ecu controls my traction control .. sorry new to all this .. thanks