Exhaust or intake noise

#1
Hi, new to the forum and Corollas as well!
I recently acquired a 2007 Corolla with a blown engine, Instaled a low mile used engine and runs great except when I put in gear and hit the throttle there’s a weird noise like an exhaust leak or intake leak only for a second when the motor is loaded up then goes away.. The exhaust manifold was cracked but welded up and new gaskets on both ends..
any suggestions would be appreciated! Thanks
 
#2
Replace the exhaust manifold. Be careful not to strip the up stream o2 sensor and use new OEM header gasket and donut gasket. DON'T you liquid or gasket maker
 
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