Hey guys so I have a 2003 Evo with a crack in the exhaust manifold and I'm pretty sure this is the source of my current problem but I'm not 100% sure because of how severely of an effect it has so my cars pushing about 30lbs of boost and I start making boost at about 3-4k rpms everything runs find if I stay under 10-15lbs but if I try to go for big boost I get a massive loss of power paired with crackling I've checked for boost leaks and I've even changed out the couplings and pipes just to he sure and I still have the problem could a cracked exhaust manifold cause something like this?

 

Yes.