Are you on evom? 20mm spacers upfront is about what you need. You might also need to roll your fenders if you on 255 series tires. 15mm spacers would require no modding of the fenders. I highly recommend ARP extended studs, note because arp are extended you need open aftermarket lug nuts. GL

Here is a pic from evom: of 20mm spacers w/ 255: Space'n - evolutionm.net