First off this this has been an intermittent on going issue. This has happened while my car was stock before i modified it and is still an on going problem. Its absolutely random. 2013 CTS-V sedan Solid isolator, 2.55 upper, reinforced brick, Airraid CAI, ID850X injectors, Speed Engineering Long tube headers to stock mufflers, AEM Wide band. So my car will start sometimes and sometimes it doesnt want to but will over time. it makes a loud click sound when i turn the key and nothing. if it keep turning the key repeatedly it keeps making the sound once each time i turn it. but it will eventually start. sometimes i wont have the problem for a few days or sometimes it will do it for 2 or 3 days straight. sometimes it will start in 5 min sometimes 45 minutes. i checked my battery terminals, i put a brand new OEM starter in, i swapped the relay under the hood and still the same outcome. Any suggestions please!? thank you in advanced.