2012 warming up noises
I have a 2012 wrx sedan with 3000 miles on it. My mods are prosport headers and up pipe, invidia down pipe with hi-flow cat, spt quad tip cat-back, turBo xs hybrid blow off valve, Aem cold air intake, and Avo TMIC, Cobb accessport with stage 2 map, sti short throw shifter.
My question is since installing the headers and intercooler, when I first start the car the first five minutes it sounds like the internals in the mufflers are going to come out. I have checked for leaks and everything is sealed up tight. I know that there is a vacume when first started and that is the only thing I can come up with. Car runs great lots of power, and after about 3-5 minutes the terrible noise goes away. Any help would be appreciated..