My RST has 17's and coilovers but ever since ive had the the rear disc conversion its thrown the offset out abit so i cant have it to low without it scraping , I want to pretty much slam this car so whats the best way to do the rear arches ? Ive also noticed it catches the rear bumper a bit too

I eventually want to get the car fully painted so they might as well do this at the same time

Thanks