Hey guys and gals I'm new to the forum and to the tuning world. I just completed my first turbo build and am having some issues. The vehicle is a 2001 Gmc Sierra C3 and it's got an on3 performance kit on it modified to fit (it didn't fit like it was supposed to originally), it's got a circle d 3200 stall, 80lb injectors, 78/75 turbo, 2bar map and sd tune. I'm getting KR anytime I'm in boost pretty much, I just replaced knock sensors and harness and also ran 110 octane in it to make sure it wasn't real knock. Any help is greatly appreciated!