Just picked up a 13 4runner limited . I had an 07 FJ before with the same motor (almost) and this runner has a louder engine , it also has a magna flow exhaust , but this 4runner engine almost sounds like it has a “supercharger” some forums have said it’s a idler pulley , some have said it’s normal noise on some 4Runners/1gr-Fe motors. Haven’t pulled the belt off to see if it a pulley yet. First time owning a 4runner.